5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 1997 - 2002 Pekka Riikonen
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
21 * This is the actual SILC server than handles everything relating to
22 * servicing the SILC connections. This is also a SILC router as a router
23 * is also normal server.
27 #include "serverincludes.h"
28 #include "server_internal.h"
30 /* Static prototypes */
31 SILC_TASK_CALLBACK(silc_server_connect_to_router_retry);
32 SILC_TASK_CALLBACK(silc_server_connect_router);
33 SILC_TASK_CALLBACK(silc_server_connect_to_router);
34 SILC_TASK_CALLBACK(silc_server_connect_to_router_second);
35 SILC_TASK_CALLBACK(silc_server_connect_to_router_final);
36 SILC_TASK_CALLBACK(silc_server_accept_new_connection);
37 SILC_TASK_CALLBACK(silc_server_accept_new_connection_second);
38 SILC_TASK_CALLBACK(silc_server_accept_new_connection_final);
39 SILC_TASK_CALLBACK(silc_server_packet_process);
40 SILC_TASK_CALLBACK(silc_server_packet_parse_real);
41 SILC_TASK_CALLBACK(silc_server_close_connection_final);
42 SILC_TASK_CALLBACK(silc_server_free_client_data_timeout);
43 SILC_TASK_CALLBACK(silc_server_timeout_remote);
44 SILC_TASK_CALLBACK(silc_server_channel_key_rekey);
45 SILC_TASK_CALLBACK(silc_server_failure_callback);
46 SILC_TASK_CALLBACK(silc_server_rekey_callback);
47 SILC_TASK_CALLBACK(silc_server_get_stats);
49 /* Allocates a new SILC server object. This has to be done before the server
50 can be used. After allocation one must call silc_server_init to initialize
51 the server. The new allocated server object is returned to the new_server
54 int silc_server_alloc(SilcServer *new_server)
58 SILC_LOG_DEBUG(("Allocating new server object"));
60 server = silc_calloc(1, sizeof(*server));
61 server->server_type = SILC_SERVER;
62 server->standalone = TRUE;
63 server->local_list = silc_calloc(1, sizeof(*server->local_list));
64 server->global_list = silc_calloc(1, sizeof(*server->global_list));
65 server->pending_commands = silc_dlist_init();
67 server->sim = silc_dlist_init();
75 /* Free's the SILC server object. This is called at the very end before
78 void silc_server_free(SilcServer server)
84 while ((sim = silc_dlist_get(server->sim)) != SILC_LIST_END) {
85 silc_dlist_del(server->sim, sim);
88 silc_dlist_uninit(server->sim);
91 silc_server_config_unref(&server->config_ref);
93 silc_rng_free(server->rng);
95 silc_pkcs_free(server->pkcs);
96 if (server->public_key)
97 silc_pkcs_public_key_free(server->public_key);
98 if (server->private_key)
99 silc_pkcs_private_key_free(server->private_key);
100 if (server->pending_commands)
101 silc_dlist_uninit(server->pending_commands);
102 if (server->id_entry)
103 silc_idlist_del_server(server->local_list, server->id_entry);
105 silc_idcache_free(server->local_list->clients);
106 silc_idcache_free(server->local_list->servers);
107 silc_idcache_free(server->local_list->channels);
108 silc_idcache_free(server->global_list->clients);
109 silc_idcache_free(server->global_list->servers);
110 silc_idcache_free(server->global_list->channels);
111 silc_hash_table_free(server->watcher_list);
113 silc_free(server->sockets);
118 /* Opens a listening port.
119 XXX This function will become more general and will support multiple
122 static bool silc_server_listen(SilcServer server, int *sock)
125 *sock = silc_net_create_server(server->config->server_info->port,
126 server->config->server_info->server_ip);
128 SILC_LOG_ERROR(("Could not create server listener: %s on %hu",
129 server->config->server_info->server_ip,
130 server->config->server_info->port));
136 /* Initializes the entire SILC server. This is called always before running
137 the server. This is called only once at the initialization of the program.
138 This binds the server to its listenning port. After this function returns
139 one should call silc_server_run to start the server. This returns TRUE
140 when everything is ok to run the server. Configuration file must be
141 read and parsed before calling this. */
143 bool silc_server_init(SilcServer server)
147 SilcServerEntry id_entry;
148 SilcIDListPurge purge;
149 SilcSocketConnection newsocket = NULL;
151 SILC_LOG_DEBUG(("Initializing server"));
153 server->starttime = time(NULL);
155 /* Take config object for us */
156 silc_server_config_ref(&server->config_ref, server->config,
159 /* Steal public and private key from the config object */
160 server->public_key = server->config->server_info->public_key;
161 server->private_key = server->config->server_info->private_key;
162 server->config->server_info->public_key = NULL;
163 server->config->server_info->private_key = NULL;
165 /* Register all configured ciphers, PKCS and hash functions. */
166 if (!silc_server_config_register_ciphers(server))
167 silc_cipher_register_default();
168 if (!silc_server_config_register_pkcs(server))
169 silc_pkcs_register_default();
170 if (!silc_server_config_register_hashfuncs(server))
171 silc_hash_register_default();
172 if (!silc_server_config_register_hmacs(server))
173 silc_hmac_register_default();
175 /* Initialize random number generator for the server. */
176 server->rng = silc_rng_alloc();
177 silc_rng_init(server->rng);
178 silc_rng_global_init(server->rng);
180 /* Initialize hash functions for server to use */
181 silc_hash_alloc("md5", &server->md5hash);
182 silc_hash_alloc("sha1", &server->sha1hash);
184 /* Allocate PKCS context for local public and private keys */
185 if (!silc_pkcs_alloc(server->public_key->name, &server->pkcs))
187 silc_pkcs_public_key_set(server->pkcs, server->public_key);
188 silc_pkcs_private_key_set(server->pkcs, server->private_key);
190 /* Initialize the scheduler */
191 server->schedule = silc_schedule_init(server->config->param.connections_max);
192 if (!server->schedule)
195 /* First, register log files configuration for error output */
196 silc_server_config_setlogfiles(server);
198 /* Initialize ID caches */
199 server->local_list->clients =
200 silc_idcache_alloc(0, SILC_ID_CLIENT, silc_idlist_client_destructor);
201 server->local_list->servers = silc_idcache_alloc(0, SILC_ID_SERVER, NULL);
202 server->local_list->channels = silc_idcache_alloc(0, SILC_ID_CHANNEL, NULL);
204 /* These are allocated for normal server as well as these hold some
205 global information that the server has fetched from its router. For
206 router these are used as they are supposed to be used on router. */
207 server->global_list->clients =
208 silc_idcache_alloc(0, SILC_ID_CLIENT, silc_idlist_client_destructor);
209 server->global_list->servers = silc_idcache_alloc(0, SILC_ID_SERVER, NULL);
210 server->global_list->channels = silc_idcache_alloc(0, SILC_ID_CHANNEL, NULL);
212 /* Init watcher list */
213 server->watcher_list =
214 silc_hash_table_alloc(1, silc_hash_client_id_hash, NULL,
215 silc_hash_data_compare, (void *)CLIENTID_HASH_LEN,
217 if (!server->watcher_list)
220 /* Create a listening server */
221 if (!silc_server_listen(server, &sock))
224 /* Set socket to non-blocking mode */
225 silc_net_set_socket_nonblock(sock);
228 /* Allocate the entire socket list that is used in server. Eventually
229 all connections will have entry in this table (it is a table of
230 pointers to the actual object that is allocated individually
232 server->sockets = silc_calloc(server->config->param.connections_max,
233 sizeof(*server->sockets));
234 if (!server->sockets)
237 /* Add ourselves also to the socket table. The entry allocated above
238 is sent as argument for fast referencing in the future. */
239 silc_socket_alloc(sock, SILC_SOCKET_TYPE_SERVER, NULL, &newsocket);
240 server->sockets[sock] = newsocket;
242 /* Perform name and address lookups to resolve the listenning address
244 if (!silc_net_check_local_by_sock(sock, &newsocket->hostname,
246 if ((server->config->require_reverse_lookup && !newsocket->hostname) ||
248 SILC_LOG_ERROR(("IP/DNS lookup failed for local host %s",
249 newsocket->hostname ? newsocket->hostname :
250 newsocket->ip ? newsocket->ip : ""));
251 server->stat.conn_failures++;
254 if (!newsocket->hostname)
255 newsocket->hostname = strdup(newsocket->ip);
257 newsocket->port = silc_net_get_local_port(sock);
259 /* Create a Server ID for the server. */
260 silc_id_create_server_id(newsocket->ip, newsocket->port, server->rng, &id);
265 server->id_string = silc_id_id2str(id, SILC_ID_SERVER);
266 server->id_string_len = silc_id_get_len(id, SILC_ID_SERVER);
267 server->id_type = SILC_ID_SERVER;
268 server->server_name = server->config->server_info->server_name;
269 server->config->server_info->server_name = NULL;
271 /* Add ourselves to the server list. We don't have a router yet
272 beacuse we haven't established a route yet. It will be done later.
273 For now, NULL is sent as router. This allocates new entry to
276 silc_idlist_add_server(server->local_list, strdup(server->server_name),
277 server->server_type, server->id, NULL, NULL);
279 SILC_LOG_ERROR(("Could not add ourselves to cache"));
282 id_entry->data.status |= SILC_IDLIST_STATUS_REGISTERED;
284 /* Put the allocated socket pointer also to the entry allocated above
285 for fast back-referencing to the socket list. */
286 newsocket->user_data = (void *)id_entry;
287 id_entry->connection = (void *)newsocket;
288 server->id_entry = id_entry;
290 /* Register protocols */
291 silc_server_protocols_register();
293 /* Add the first task to the scheduler. This is task that is executed by
294 timeout. It expires as soon as the caller calls silc_server_run. This
295 task performs authentication protocol and key exchange with our
297 silc_schedule_task_add(server->schedule, 0,
298 silc_server_connect_to_router,
299 (void *)server, 0, 1,
301 SILC_TASK_PRI_NORMAL);
303 /* Add listener task to the scheduler. This task receives new connections
304 to the server. This task remains on the queue until the end of the
306 silc_schedule_task_add(server->schedule, sock,
307 silc_server_accept_new_connection,
308 (void *)server, 0, 0,
310 SILC_TASK_PRI_NORMAL);
311 server->listenning = TRUE;
313 /* If server connections has been configured then we must be router as
314 normal server cannot have server connections, only router connections. */
315 if (server->config->servers) {
316 SilcServerConfigServer *ptr = server->config->servers;
318 server->server_type = SILC_ROUTER;
320 if (ptr->backup_router) {
321 server->server_type = SILC_BACKUP_ROUTER;
322 server->backup_router = TRUE;
323 server->id_entry->server_type = SILC_BACKUP_ROUTER;
330 /* Register the ID Cache purge task. This periodically purges the ID cache
331 and removes the expired cache entries. */
333 /* Clients local list */
334 purge = silc_calloc(1, sizeof(*purge));
335 purge->cache = server->local_list->clients;
336 purge->schedule = server->schedule;
337 purge->timeout = 600;
338 silc_schedule_task_add(purge->schedule, 0,
340 (void *)purge, purge->timeout, 0,
341 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
343 /* Clients global list */
344 purge = silc_calloc(1, sizeof(*purge));
345 purge->cache = server->global_list->clients;
346 purge->schedule = server->schedule;
347 purge->timeout = 300;
348 silc_schedule_task_add(purge->schedule, 0,
350 (void *)purge, purge->timeout, 0,
351 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
353 /* If we are normal server we'll retrieve network statisticial information
354 once in a while from the router. */
355 if (server->server_type == SILC_SERVER)
356 silc_schedule_task_add(purge->schedule, 0, silc_server_get_stats,
357 server, 10, 0, SILC_TASK_TIMEOUT,
360 SILC_LOG_DEBUG(("Server initialized"));
362 /* We are done here, return succesfully */
366 silc_server_config_unref(&server->config_ref);
367 silc_net_close_server(sock);
371 /* This function basically reads the config file again and switches the config
372 object pointed by the server object. After that, we have to fix various
373 things such as the server_name and the listening ports.
374 Keep in mind that we no longer have the root privileges at this point. */
376 bool silc_server_rehash(SilcServer server)
378 SilcServerConfig newconfig;
380 SILC_LOG_INFO(("Rehashing server"));
382 /* Reset the logging system */
383 silc_log_quick = TRUE;
384 silc_log_flush_all();
386 /* Start the main rehash phase (read again the config file) */
387 newconfig = silc_server_config_alloc(server->config_file);
389 SILC_LOG_ERROR(("Rehash FAILED."));
393 /* Reinit scheduler if necessary */
394 if (newconfig->param.connections_max > server->config->param.connections_max)
395 if (!silc_schedule_reinit(server->schedule,
396 newconfig->param.connections_max))
399 /* Fix the server_name field */
400 if (strcmp(server->server_name, newconfig->server_info->server_name)) {
401 silc_free(server->server_name);
402 server->server_name = newconfig->server_info->server_name;
403 newconfig->server_info->server_name = NULL;
405 /* Update the idcache list with a fresh pointer */
406 silc_free(server->id_entry->server_name);
407 server->id_entry->server_name = strdup(server->server_name);
408 if (!silc_idcache_del_by_context(server->local_list->servers,
411 if (!silc_idcache_add(server->local_list->servers,
412 server->id_entry->server_name,
413 server->id_entry->id, server->id_entry, 0, NULL))
418 silc_server_config_setlogfiles(server);
420 /* Change new key pair if necessary */
421 if (newconfig->server_info->public_key &&
422 !silc_pkcs_public_key_compare(server->public_key,
423 newconfig->server_info->public_key)) {
424 silc_pkcs_public_key_free(server->public_key);
425 silc_pkcs_private_key_free(server->private_key);
426 server->public_key = newconfig->server_info->public_key;
427 server->private_key = newconfig->server_info->private_key;
428 newconfig->server_info->public_key = NULL;
429 newconfig->server_info->private_key = NULL;
431 /* Allocate PKCS context for local public and private keys */
432 silc_pkcs_free(server->pkcs);
433 if (!silc_pkcs_alloc(server->public_key->name, &server->pkcs))
435 silc_pkcs_public_key_set(server->pkcs, server->public_key);
436 silc_pkcs_private_key_set(server->pkcs, server->private_key);
439 /* Go through all configured routers after rehash */
440 silc_schedule_task_add(server->schedule, 0,
441 silc_server_connect_to_router,
442 (void *)server, 0, 1,
444 SILC_TASK_PRI_NORMAL);
446 /* Check whether our router status has changed */
447 if (newconfig->servers) {
448 SilcServerConfigServer *ptr = newconfig->servers;
450 server->server_type = SILC_ROUTER;
452 if (ptr->backup_router) {
453 server->server_type = SILC_BACKUP_ROUTER;
454 server->backup_router = TRUE;
455 server->id_entry->server_type = SILC_BACKUP_ROUTER;
462 /* Our old config is gone now. We'll unreference our reference made in
463 silc_server_init and then destroy it since we are destroying it
464 underneath the application (layer which called silc_server_init). */
465 silc_server_config_unref(&server->config_ref);
466 silc_server_config_destroy(server->config);
468 /* Take new config context */
469 server->config = newconfig;
470 silc_server_config_ref(&server->config_ref, server->config, server->config);
472 SILC_LOG_DEBUG(("Server rehashed"));
477 /* The heart of the server. This runs the scheduler thus runs the server.
478 When this returns the server has been stopped and the program will
481 void silc_server_run(SilcServer server)
483 SILC_LOG_INFO(("SILC Server started"));
485 /* Start the scheduler, the heart of the SILC server. When this returns
486 the program will be terminated. */
487 silc_schedule(server->schedule);
490 /* Stops the SILC server. This function is used to shutdown the server.
491 This is usually called after the scheduler has returned. After stopping
492 the server one should call silc_server_free. */
494 void silc_server_stop(SilcServer server)
496 SILC_LOG_DEBUG(("Stopping server"));
498 if (server->schedule) {
499 silc_schedule_stop(server->schedule);
500 silc_schedule_uninit(server->schedule);
501 server->schedule = NULL;
504 silc_server_protocols_unregister();
506 SILC_LOG_DEBUG(("Server stopped"));
509 /* Function that is called when the network connection to a router has
510 been established. This will continue with the key exchange protocol
511 with the remote router. */
513 void silc_server_start_key_exchange(SilcServer server,
514 SilcServerConnection sconn,
517 SilcSocketConnection newsocket;
518 SilcProtocol protocol;
519 SilcServerKEInternalContext *proto_ctx;
520 SilcServerConfigRouter *conn =
521 (SilcServerConfigRouter *) sconn->conn.ref_ptr;
524 /* Cancel any possible retry timeouts */
525 silc_schedule_task_del_by_callback(server->schedule,
526 silc_server_connect_router);
528 /* Set socket options */
529 silc_net_set_socket_nonblock(sock);
530 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
532 /* Create socket connection for the connection. Even though we
533 know that we are connecting to a router we will mark the socket
534 to be unknown connection until we have executed authentication
536 silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
537 server->sockets[sock] = newsocket;
538 newsocket->hostname = strdup(sconn->remote_host);
539 newsocket->ip = strdup(sconn->remote_host);
540 newsocket->port = sconn->remote_port;
541 sconn->sock = newsocket;
543 /* Allocate internal protocol context. This is sent as context
545 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
546 proto_ctx->server = (void *)server;
547 proto_ctx->context = (void *)sconn;
548 proto_ctx->sock = newsocket;
549 proto_ctx->rng = server->rng;
550 proto_ctx->responder = FALSE;
552 /* Set Key Exchange flags from configuration, but fall back to global
554 SILC_GET_SKE_FLAGS(conn, proto_ctx);
555 if (server->config->param.key_exchange_pfs)
556 proto_ctx->flags |= SILC_SKE_SP_FLAG_PFS;
558 /* Perform key exchange protocol. silc_server_connect_to_router_second
559 will be called after the protocol is finished. */
560 silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
561 &protocol, proto_ctx,
562 silc_server_connect_to_router_second);
563 newsocket->protocol = protocol;
565 /* Register a timeout task that will be executed if the protocol
566 is not executed within set limit. */
567 proto_ctx->timeout_task =
568 silc_schedule_task_add(server->schedule, sock,
569 silc_server_timeout_remote,
570 server, server->config->key_exchange_timeout, 0,
574 /* Register the connection for network input and output. This sets
575 that scheduler will listen for incoming packets for this connection
576 and sets that outgoing packets may be sent to this connection as
577 well. However, this doesn't set the scheduler for outgoing traffic,
578 it will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
579 later when outgoing data is available. */
580 context = (void *)server;
581 SILC_REGISTER_CONNECTION_FOR_IO(sock);
583 /* Run the protocol */
584 silc_protocol_execute(protocol, server->schedule, 0, 0);
587 /* Timeout callback that will be called to retry connecting to remote
588 router. This is used by both normal and router server. This will wait
589 before retrying the connecting. The timeout is generated by exponential
590 backoff algorithm. */
592 SILC_TASK_CALLBACK(silc_server_connect_to_router_retry)
594 SilcServerConnection sconn = (SilcServerConnection)context;
595 SilcServer server = sconn->server;
596 SilcServerConfigRouter *conn = sconn->conn.ref_ptr;
597 SilcServerConfigConnParams *param =
598 (conn->param ? conn->param : &server->config->param);
600 SILC_LOG_INFO(("Retrying connecting to a router"));
602 /* Calculate next timeout */
603 if (sconn->retry_count >= 1) {
604 sconn->retry_timeout = sconn->retry_timeout * SILC_SERVER_RETRY_MULTIPLIER;
605 if (sconn->retry_timeout > param->reconnect_interval_max)
606 sconn->retry_timeout = param->reconnect_interval_max;
608 sconn->retry_timeout = param->reconnect_interval;
610 sconn->retry_count++;
611 sconn->retry_timeout = sconn->retry_timeout +
612 silc_rng_get_rn32(server->rng) % SILC_SERVER_RETRY_RANDOMIZER;
614 /* If we've reached max retry count, give up. */
615 if ((sconn->retry_count > param->reconnect_count) &&
616 !param->reconnect_keep_trying) {
617 SILC_LOG_ERROR(("Could not connect to router, giving up"));
618 silc_server_config_unref(&sconn->conn);
619 silc_free(sconn->remote_host);
620 silc_free(sconn->backup_replace_ip);
625 /* We will lookup a fresh pointer later */
626 silc_server_config_unref(&sconn->conn);
628 /* Wait one before retrying */
629 silc_schedule_task_add(server->schedule, 0, silc_server_connect_router,
630 context, sconn->retry_timeout, 0,
631 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
634 /* Generic routine to use connect to a router. */
636 SILC_TASK_CALLBACK(silc_server_connect_router)
638 SilcServerConnection sconn = (SilcServerConnection)context;
639 SilcServer server = sconn->server;
640 SilcServerConfigRouter *rconn;
643 SILC_LOG_INFO(("Connecting to the %s %s on port %d",
644 (sconn->backup ? "backup router" : "router"),
645 sconn->remote_host, sconn->remote_port));
647 server->router_connect = time(NULL);
648 rconn = silc_server_config_find_router_conn(server, sconn->remote_host,
651 SILC_LOG_INFO(("Unconfigured %s connection %s:%d, cannot connect",
652 (sconn->backup ? "backup router" : "router"),
653 sconn->remote_host, sconn->remote_port));
654 silc_free(sconn->remote_host);
655 silc_free(sconn->backup_replace_ip);
659 silc_server_config_ref(&sconn->conn, server->config, (void *)rconn);
661 /* Connect to remote host */
662 sock = silc_net_create_connection(server->config->server_info->server_ip,
666 SILC_LOG_ERROR(("Could not connect to router %s:%d",
667 sconn->remote_host, sconn->remote_port));
668 if (!sconn->no_reconnect)
669 silc_schedule_task_add(server->schedule, 0,
670 silc_server_connect_to_router_retry,
671 context, 0, 1, SILC_TASK_TIMEOUT,
672 SILC_TASK_PRI_NORMAL);
674 silc_server_config_unref(&sconn->conn);
678 /* Continue with key exchange protocol */
679 silc_server_start_key_exchange(server, sconn, sock);
682 /* This function connects to our primary router or if we are a router this
683 establishes all our primary routes. This is called at the start of the
684 server to do authentication and key exchange with our router - called
687 SILC_TASK_CALLBACK(silc_server_connect_to_router)
689 SilcServer server = (SilcServer)context;
690 SilcServerConnection sconn;
691 SilcServerConfigRouter *ptr;
693 SILC_LOG_DEBUG(("Connecting to router(s)"));
695 if (server->server_type == SILC_SERVER) {
696 SILC_LOG_DEBUG(("We are normal server"));
697 } else if (server->server_type == SILC_ROUTER) {
698 SILC_LOG_DEBUG(("We are router"));
700 SILC_LOG_DEBUG(("We are backup router/normal server"));
703 if (!server->config->routers) {
704 /* There wasn't a configured router, we will continue but we don't
705 have a connection to outside world. We will be standalone server. */
706 SILC_LOG_DEBUG(("No router(s), server will be standalone"));
707 server->standalone = TRUE;
711 /* Cancel any possible retry timeouts */
712 silc_schedule_task_del_by_callback(server->schedule,
713 silc_server_connect_router);
714 silc_schedule_task_del_by_callback(server->schedule,
715 silc_server_connect_to_router_retry);
717 /* Create the connections to all our routes */
718 for (ptr = server->config->routers; ptr; ptr = ptr->next) {
720 SILC_LOG_DEBUG(("%s connection [%s] %s:%d",
721 ptr->backup_router ? "Backup router" : "Router",
722 ptr->initiator ? "Initiator" : "Responder",
723 ptr->host, ptr->port));
725 if (ptr->initiator) {
726 /* Check whether we are connected to this host already */
727 if (silc_server_num_sockets_by_remote(server,
728 silc_net_is_ip(ptr->host) ?
730 silc_net_is_ip(ptr->host) ?
731 NULL : ptr->host, ptr->port,
732 SILC_SOCKET_TYPE_ROUTER)) {
733 SILC_LOG_DEBUG(("We are already connected to this router"));
737 /* Allocate connection object for hold connection specific stuff. */
738 sconn = silc_calloc(1, sizeof(*sconn));
739 sconn->server = server;
740 sconn->remote_host = strdup(ptr->host);
741 sconn->remote_port = ptr->port;
742 sconn->backup = ptr->backup_router;
744 sconn->backup_replace_ip = strdup(ptr->backup_replace_ip);
745 sconn->backup_replace_port = ptr->backup_replace_port;
748 if (!server->router_conn && !sconn->backup)
749 server->router_conn = sconn;
751 silc_schedule_task_add(server->schedule, 0,
752 silc_server_connect_router,
753 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
754 SILC_TASK_PRI_NORMAL);
759 /* Second part of connecting to router(s). Key exchange protocol has been
760 executed and now we will execute authentication protocol. */
762 SILC_TASK_CALLBACK(silc_server_connect_to_router_second)
764 SilcProtocol protocol = (SilcProtocol)context;
765 SilcServerKEInternalContext *ctx =
766 (SilcServerKEInternalContext *)protocol->context;
767 SilcServer server = (SilcServer)ctx->server;
768 SilcServerConnection sconn = (SilcServerConnection)ctx->context;
769 SilcSocketConnection sock = ctx->sock;
770 SilcServerConnAuthInternalContext *proto_ctx;
771 SilcServerConfigRouter *conn = NULL;
773 SILC_LOG_DEBUG(("Start"));
775 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
776 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
777 /* Error occured during protocol */
778 silc_protocol_free(protocol);
779 sock->protocol = NULL;
780 silc_ske_free_key_material(ctx->keymat);
782 silc_packet_context_free(ctx->packet);
784 silc_ske_free(ctx->ske);
785 silc_free(ctx->dest_id);
787 silc_server_config_unref(&sconn->conn);
788 silc_free(sconn->remote_host);
789 silc_free(sconn->backup_replace_ip);
791 silc_schedule_task_del_by_callback(server->schedule,
792 silc_server_failure_callback);
793 silc_server_disconnect_remote(server, sock, "Server closed connection: "
794 "Key exchange failed");
798 /* We now have the key material as the result of the key exchange
799 protocol. Take the key material into use. Free the raw key material
800 as soon as we've set them into use. */
801 if (!silc_server_protocol_ke_set_keys(server, ctx->ske,
802 ctx->sock, ctx->keymat,
803 ctx->ske->prop->cipher,
804 ctx->ske->prop->pkcs,
805 ctx->ske->prop->hash,
806 ctx->ske->prop->hmac,
807 ctx->ske->prop->group,
809 silc_protocol_free(protocol);
810 sock->protocol = NULL;
811 silc_ske_free_key_material(ctx->keymat);
813 silc_packet_context_free(ctx->packet);
815 silc_ske_free(ctx->ske);
816 silc_free(ctx->dest_id);
818 silc_server_config_unref(&sconn->conn);
819 silc_free(sconn->remote_host);
820 silc_free(sconn->backup_replace_ip);
822 silc_schedule_task_del_by_callback(server->schedule,
823 silc_server_failure_callback);
824 silc_server_disconnect_remote(server, sock, "Server closed connection: "
825 "Key exchange failed");
828 silc_ske_free_key_material(ctx->keymat);
830 /* Allocate internal context for the authentication protocol. This
831 is sent as context for the protocol. */
832 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
833 proto_ctx->server = (void *)server;
834 proto_ctx->context = (void *)sconn;
835 proto_ctx->sock = sock;
836 proto_ctx->ske = ctx->ske; /* Save SKE object from previous protocol */
837 proto_ctx->dest_id_type = ctx->dest_id_type;
838 proto_ctx->dest_id = ctx->dest_id;
840 /* Resolve the authentication method used in this connection. Check if
841 we find a match from user configured connections */
842 if (!sconn->conn.ref_ptr)
843 conn = silc_server_config_find_router_conn(server, sock->hostname,
846 conn = sconn->conn.ref_ptr;
849 /* Match found. Use the configured authentication method. Take only
850 the passphrase, since for public key auth we automatically use
851 our local key pair. */
852 if (conn->passphrase) {
853 if (conn->publickeys && !server->config->prefer_passphrase_auth) {
854 proto_ctx->auth_meth = SILC_AUTH_PUBLIC_KEY;
856 proto_ctx->auth_data = strdup(conn->passphrase);
857 proto_ctx->auth_data_len = strlen(conn->passphrase);
858 proto_ctx->auth_meth = SILC_AUTH_PASSWORD;
860 } else if (conn->publickeys) {
861 proto_ctx->auth_meth = SILC_AUTH_PUBLIC_KEY;
863 proto_ctx->auth_meth = SILC_AUTH_NONE;
866 SILC_LOG_ERROR(("Could not find connection data for %s (%s) on port",
867 sock->hostname, sock->ip, sock->port));
868 silc_protocol_free(protocol);
869 sock->protocol = NULL;
871 silc_packet_context_free(ctx->packet);
873 silc_ske_free(ctx->ske);
874 silc_free(ctx->dest_id);
876 silc_server_config_unref(&sconn->conn);
877 silc_free(sconn->remote_host);
878 silc_free(sconn->backup_replace_ip);
880 silc_schedule_task_del_by_callback(server->schedule,
881 silc_server_failure_callback);
882 silc_server_disconnect_remote(server, sock, "Server closed connection: "
883 "Key exchange failed");
887 /* Free old protocol as it is finished now */
888 silc_protocol_free(protocol);
890 silc_packet_context_free(ctx->packet);
892 sock->protocol = NULL;
894 /* Allocate the authentication protocol. This is allocated here
895 but we won't start it yet. We will be receiving party of this
896 protocol thus we will wait that connecting party will make
898 silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
899 &sock->protocol, proto_ctx,
900 silc_server_connect_to_router_final);
902 /* Register timeout task. If the protocol is not executed inside
903 this timelimit the connection will be terminated. */
904 proto_ctx->timeout_task =
905 silc_schedule_task_add(server->schedule, sock->sock,
906 silc_server_timeout_remote,
908 server->config->conn_auth_timeout, 0,
912 /* Run the protocol */
913 silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
916 /* Finalizes the connection to router. Registers a server task to the
917 queue so that we can accept new connections. */
919 SILC_TASK_CALLBACK(silc_server_connect_to_router_final)
921 SilcProtocol protocol = (SilcProtocol)context;
922 SilcServerConnAuthInternalContext *ctx =
923 (SilcServerConnAuthInternalContext *)protocol->context;
924 SilcServer server = (SilcServer)ctx->server;
925 SilcServerConnection sconn = (SilcServerConnection)ctx->context;
926 SilcSocketConnection sock = ctx->sock;
927 SilcServerEntry id_entry;
929 SilcServerHBContext hb_context;
930 unsigned char *id_string;
932 SilcIDListData idata;
933 SilcServerConfigRouter *conn = NULL;
934 SilcServerConfigConnParams *param = NULL;
936 SILC_LOG_DEBUG(("Start"));
938 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
939 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
940 /* Error occured during protocol */
941 silc_free(ctx->dest_id);
942 silc_server_disconnect_remote(server, sock, "Server closed connection: "
943 "Authentication failed");
947 /* Add a task to the queue. This task receives new connections to the
948 server. This task remains on the queue until the end of the program. */
949 if (!server->listenning && !sconn->backup) {
950 silc_schedule_task_add(server->schedule, server->sock,
951 silc_server_accept_new_connection,
952 (void *)server, 0, 0,
954 SILC_TASK_PRI_NORMAL);
955 server->listenning = TRUE;
958 /* Send NEW_SERVER packet to the router. We will become registered
959 to the SILC network after sending this packet. */
960 id_string = silc_id_id2str(server->id, SILC_ID_SERVER);
961 id_len = silc_id_get_len(server->id, SILC_ID_SERVER);
962 packet = silc_buffer_alloc(2 + 2 + id_len + strlen(server->server_name));
963 silc_buffer_pull_tail(packet, SILC_BUFFER_END(packet));
964 silc_buffer_format(packet,
965 SILC_STR_UI_SHORT(id_len),
966 SILC_STR_UI_XNSTRING(id_string, id_len),
967 SILC_STR_UI_SHORT(strlen(server->server_name)),
968 SILC_STR_UI_XNSTRING(server->server_name,
969 strlen(server->server_name)),
972 /* Send the packet */
973 silc_server_packet_send(server, ctx->sock, SILC_PACKET_NEW_SERVER, 0,
974 packet->data, packet->len, TRUE);
975 silc_buffer_free(packet);
976 silc_free(id_string);
978 SILC_LOG_INFO(("Connected to router %s", sock->hostname));
980 /* Check that we do not have this ID already */
981 id_entry = silc_idlist_find_server_by_id(server->local_list,
982 ctx->dest_id, TRUE, NULL);
984 silc_idcache_del_by_context(server->local_list->servers, id_entry);
986 id_entry = silc_idlist_find_server_by_id(server->global_list,
987 ctx->dest_id, TRUE, NULL);
989 silc_idcache_del_by_context(server->global_list->servers, id_entry);
992 SILC_LOG_DEBUG(("New server id(%s)",
993 silc_id_render(ctx->dest_id, SILC_ID_SERVER)));
995 /* Add the connected router to global server list */
996 id_entry = silc_idlist_add_server(server->global_list,
997 strdup(sock->hostname),
998 SILC_ROUTER, ctx->dest_id, NULL, sock);
1000 silc_free(ctx->dest_id);
1001 SILC_LOG_ERROR(("Cannot add new server entry to cache"));
1002 silc_server_disconnect_remote(server, sock, "Server closed connection: "
1003 "Authentication failed");
1007 silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
1008 silc_free(sock->user_data);
1009 sock->user_data = (void *)id_entry;
1010 sock->type = SILC_SOCKET_TYPE_ROUTER;
1011 idata = (SilcIDListData)sock->user_data;
1012 idata->status |= SILC_IDLIST_STATUS_REGISTERED;
1014 conn = sconn->conn.ref_ptr;
1015 param = &server->config->param;
1016 if (conn && conn->param)
1017 param = conn->param;
1019 /* Perform keepalive. The `hb_context' will be freed automatically
1020 when finally calling the silc_socket_free function. */
1021 hb_context = silc_calloc(1, sizeof(*hb_context));
1022 hb_context->server = server;
1023 silc_socket_set_heartbeat(sock, param->keepalive_secs, hb_context,
1024 silc_server_perform_heartbeat,
1027 /* Register re-key timeout */
1028 idata->rekey->timeout = param->key_exchange_rekey;
1029 idata->rekey->context = (void *)server;
1030 silc_schedule_task_add(server->schedule, sock->sock,
1031 silc_server_rekey_callback,
1032 (void *)sock, idata->rekey->timeout, 0,
1033 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
1035 if (!sconn->backup) {
1036 /* Mark this router our primary router if we're still standalone */
1037 if (server->standalone) {
1038 server->id_entry->router = id_entry;
1039 server->router = id_entry;
1040 server->standalone = FALSE;
1042 /* If we are router then announce our possible servers. */
1043 if (server->server_type == SILC_ROUTER)
1044 silc_server_announce_servers(server, FALSE, 0,
1045 server->router->connection);
1047 /* Announce our clients and channels to the router */
1048 silc_server_announce_clients(server, 0, server->router->connection);
1049 silc_server_announce_channels(server, 0, server->router->connection);
1052 /* Add this server to be our backup router */
1053 silc_server_backup_add(server, id_entry, sconn->backup_replace_ip,
1054 sconn->backup_replace_port, FALSE);
1057 sock->protocol = NULL;
1059 /* Call the completion callback to indicate that we've connected to
1061 if (sconn->callback)
1062 (*sconn->callback)(server, id_entry, sconn->callback_context);
1065 /* Free the temporary connection data context */
1067 silc_server_config_unref(&sconn->conn);
1068 silc_free(sconn->remote_host);
1069 silc_free(sconn->backup_replace_ip);
1072 if (sconn == server->router_conn)
1073 server->router_conn = NULL;
1075 /* Free the protocol object */
1076 if (sock->protocol == protocol)
1077 sock->protocol = NULL;
1078 silc_protocol_free(protocol);
1080 silc_packet_context_free(ctx->packet);
1082 silc_ske_free(ctx->ske);
1083 if (ctx->auth_meth == SILC_AUTH_PASSWORD)
1084 silc_free(ctx->auth_data);
1088 /* Host lookup callback that is called after the incoming connection's
1089 IP and FQDN lookup is performed. This will actually check the acceptance
1090 of the incoming connection and will register the key exchange protocol
1091 for this connection. */
1094 silc_server_accept_new_connection_lookup(SilcSocketConnection sock,
1097 SilcServer server = (SilcServer)context;
1098 SilcServerKEInternalContext *proto_ctx;
1099 SilcServerConfigClient *cconfig = NULL;
1100 SilcServerConfigServer *sconfig = NULL;
1101 SilcServerConfigRouter *rconfig = NULL;
1102 SilcServerConfigDeny *deny;
1105 SILC_LOG_DEBUG(("Start"));
1107 /* Check whether we could resolve both IP and FQDN. */
1108 if (!sock->ip || (!strcmp(sock->ip, sock->hostname) &&
1109 server->config->require_reverse_lookup)) {
1110 SILC_LOG_ERROR(("IP/DNS lookup failed %s",
1111 sock->hostname ? sock->hostname :
1112 sock->ip ? sock->ip : ""));
1113 server->stat.conn_failures++;
1114 silc_server_disconnect_remote(server, sock,
1115 "Server closed connection: Unknown host");
1119 /* Register the connection for network input and output. This sets
1120 that scheduler will listen for incoming packets for this connection
1121 and sets that outgoing packets may be sent to this connection as well.
1122 However, this doesn't set the scheduler for outgoing traffic, it
1123 will be set separately by calling SILC_SET_CONNECTION_FOR_OUTPUT,
1124 later when outgoing data is available. */
1125 SILC_REGISTER_CONNECTION_FOR_IO(sock->sock);
1127 SILC_LOG_INFO(("Incoming connection %s (%s)", sock->hostname,
1130 port = server->sockets[server->sock]->port; /* Listenning port */
1132 /* Check whether this connection is denied to connect to us. */
1133 deny = silc_server_config_find_denied(server, sock->ip);
1135 deny = silc_server_config_find_denied(server, sock->hostname);
1137 /* The connection is denied */
1138 SILC_LOG_INFO(("Connection %s (%s) is denied",
1139 sock->hostname, sock->ip));
1140 silc_server_disconnect_remote(server, sock, deny->reason ?
1142 "Server closed connection: "
1143 "Connection refused");
1144 server->stat.conn_failures++;
1148 /* Check whether we have configured this sort of connection at all. We
1149 have to check all configurations since we don't know what type of
1150 connection this is. */
1151 if (!(cconfig = silc_server_config_find_client(server, sock->ip)))
1152 cconfig = silc_server_config_find_client(server, sock->hostname);
1153 if (!(sconfig = silc_server_config_find_server_conn(server, sock->ip)))
1154 sconfig = silc_server_config_find_server_conn(server, sock->hostname);
1155 if (server->server_type == SILC_ROUTER) {
1156 if (!(rconfig = silc_server_config_find_router_conn(server,
1158 rconfig = silc_server_config_find_router_conn(server, sock->hostname,
1161 if (!cconfig && !sconfig && !rconfig) {
1162 SILC_LOG_INFO(("Connection %s (%s) is not allowed", sock->hostname,
1164 silc_server_disconnect_remote(server, sock,
1165 "Server closed connection: "
1166 "Connection refused");
1167 server->stat.conn_failures++;
1171 /* The connection is allowed */
1173 /* Allocate internal context for key exchange protocol. This is
1174 sent as context for the protocol. */
1175 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1176 proto_ctx->server = context;
1177 proto_ctx->sock = sock;
1178 proto_ctx->rng = server->rng;
1179 proto_ctx->responder = TRUE;
1180 silc_server_config_ref(&proto_ctx->cconfig, server->config, cconfig);
1181 silc_server_config_ref(&proto_ctx->sconfig, server->config, sconfig);
1182 silc_server_config_ref(&proto_ctx->rconfig, server->config, rconfig);
1184 /* Take flags for key exchange. Since we do not know what type of connection
1185 this is, we go through all found configurations and use the global ones
1186 as well. This will result always into strictest key exchange flags. */
1187 SILC_GET_SKE_FLAGS(cconfig, proto_ctx);
1188 SILC_GET_SKE_FLAGS(sconfig, proto_ctx);
1189 SILC_GET_SKE_FLAGS(rconfig, proto_ctx);
1190 if (server->config->param.key_exchange_pfs)
1191 proto_ctx->flags |= SILC_SKE_SP_FLAG_PFS;
1193 /* Prepare the connection for key exchange protocol. We allocate the
1194 protocol but will not start it yet. The connector will be the
1195 initiator of the protocol thus we will wait for initiation from
1196 there before we start the protocol. */
1197 server->stat.auth_attempts++;
1198 silc_protocol_alloc(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
1199 &sock->protocol, proto_ctx,
1200 silc_server_accept_new_connection_second);
1202 /* Register a timeout task that will be executed if the connector
1203 will not start the key exchange protocol within specified timeout
1204 and the connection will be closed. */
1205 proto_ctx->timeout_task =
1206 silc_schedule_task_add(server->schedule, sock->sock,
1207 silc_server_timeout_remote,
1208 context, server->config->key_exchange_timeout, 0,
1213 /* Accepts new connections to the server. Accepting new connections are
1214 done in three parts to make it async. */
1216 SILC_TASK_CALLBACK(silc_server_accept_new_connection)
1218 SilcServer server = (SilcServer)context;
1219 SilcSocketConnection newsocket;
1222 SILC_LOG_DEBUG(("Accepting new connection"));
1224 server->stat.conn_attempts++;
1226 sock = silc_net_accept_connection(server->sock);
1228 SILC_LOG_ERROR(("Could not accept new connection: %s", strerror(errno)));
1229 server->stat.conn_failures++;
1233 /* Check for maximum allowed connections */
1234 if (sock > server->config->param.connections_max) {
1235 SILC_LOG_ERROR(("Refusing connection, server is full"));
1236 server->stat.conn_failures++;
1237 silc_net_close_connection(sock);
1241 /* Set socket options */
1242 silc_net_set_socket_nonblock(sock);
1243 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
1245 /* We don't create a ID yet, since we don't know what type of connection
1246 this is yet. But, we do add the connection to the socket table. */
1247 silc_socket_alloc(sock, SILC_SOCKET_TYPE_UNKNOWN, NULL, &newsocket);
1248 server->sockets[sock] = newsocket;
1250 /* Perform asynchronous host lookup. This will lookup the IP and the
1251 FQDN of the remote connection. After the lookup is done the connection
1252 is accepted further. */
1253 silc_socket_host_lookup(newsocket, TRUE,
1254 silc_server_accept_new_connection_lookup, context,
1258 /* Second part of accepting new connection. Key exchange protocol has been
1259 performed and now it is time to do little connection authentication
1260 protocol to figure out whether this connection is client or server
1261 and whether it has right to access this server (especially server
1262 connections needs to be authenticated). */
1264 SILC_TASK_CALLBACK(silc_server_accept_new_connection_second)
1266 SilcProtocol protocol = (SilcProtocol)context;
1267 SilcServerKEInternalContext *ctx =
1268 (SilcServerKEInternalContext *)protocol->context;
1269 SilcServer server = (SilcServer)ctx->server;
1270 SilcSocketConnection sock = ctx->sock;
1271 SilcServerConnAuthInternalContext *proto_ctx;
1273 SILC_LOG_DEBUG(("Start"));
1275 if ((protocol->state == SILC_PROTOCOL_STATE_ERROR) ||
1276 (protocol->state == SILC_PROTOCOL_STATE_FAILURE)) {
1277 /* Error occured during protocol */
1278 silc_protocol_free(protocol);
1279 sock->protocol = NULL;
1280 silc_ske_free_key_material(ctx->keymat);
1282 silc_packet_context_free(ctx->packet);
1284 silc_ske_free(ctx->ske);
1285 silc_free(ctx->dest_id);
1286 silc_server_config_unref(&ctx->cconfig);
1287 silc_server_config_unref(&ctx->sconfig);
1288 silc_server_config_unref(&ctx->rconfig);
1290 silc_schedule_task_del_by_callback(server->schedule,
1291 silc_server_failure_callback);
1292 silc_server_disconnect_remote(server, sock, "Server closed connection: "
1293 "Key exchange failed");
1294 server->stat.auth_failures++;
1298 /* We now have the key material as the result of the key exchange
1299 protocol. Take the key material into use. Free the raw key material
1300 as soon as we've set them into use. */
1301 if (!silc_server_protocol_ke_set_keys(server, ctx->ske,
1302 ctx->sock, ctx->keymat,
1303 ctx->ske->prop->cipher,
1304 ctx->ske->prop->pkcs,
1305 ctx->ske->prop->hash,
1306 ctx->ske->prop->hmac,
1307 ctx->ske->prop->group,
1309 silc_protocol_free(protocol);
1310 sock->protocol = NULL;
1311 silc_ske_free_key_material(ctx->keymat);
1313 silc_packet_context_free(ctx->packet);
1315 silc_ske_free(ctx->ske);
1316 silc_free(ctx->dest_id);
1317 silc_server_config_unref(&ctx->cconfig);
1318 silc_server_config_unref(&ctx->sconfig);
1319 silc_server_config_unref(&ctx->rconfig);
1321 silc_schedule_task_del_by_callback(server->schedule,
1322 silc_server_failure_callback);
1323 silc_server_disconnect_remote(server, sock, "Server closed connection: "
1324 "Key exchange failed");
1325 server->stat.auth_failures++;
1328 silc_ske_free_key_material(ctx->keymat);
1330 /* Allocate internal context for the authentication protocol. This
1331 is sent as context for the protocol. */
1332 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
1333 proto_ctx->server = (void *)server;
1334 proto_ctx->sock = sock;
1335 proto_ctx->ske = ctx->ske; /* Save SKE object from previous protocol */
1336 proto_ctx->responder = TRUE;
1337 proto_ctx->dest_id_type = ctx->dest_id_type;
1338 proto_ctx->dest_id = ctx->dest_id;
1339 proto_ctx->cconfig = ctx->cconfig;
1340 proto_ctx->sconfig = ctx->sconfig;
1341 proto_ctx->rconfig = ctx->rconfig;
1343 /* Free old protocol as it is finished now */
1344 silc_protocol_free(protocol);
1346 silc_packet_context_free(ctx->packet);
1348 sock->protocol = NULL;
1350 /* Allocate the authentication protocol. This is allocated here
1351 but we won't start it yet. We will be receiving party of this
1352 protocol thus we will wait that connecting party will make
1353 their first move. */
1354 silc_protocol_alloc(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
1355 &sock->protocol, proto_ctx,
1356 silc_server_accept_new_connection_final);
1358 /* Register timeout task. If the protocol is not executed inside
1359 this timelimit the connection will be terminated. */
1360 proto_ctx->timeout_task =
1361 silc_schedule_task_add(server->schedule, sock->sock,
1362 silc_server_timeout_remote,
1364 server->config->conn_auth_timeout, 0,
1369 /* Final part of accepting new connection. The connection has now
1370 been authenticated and keys has been exchanged. We also know whether
1371 this is client or server connection. */
1373 SILC_TASK_CALLBACK(silc_server_accept_new_connection_final)
1375 SilcProtocol protocol = (SilcProtocol)context;
1376 SilcServerConnAuthInternalContext *ctx =
1377 (SilcServerConnAuthInternalContext *)protocol->context;
1378 SilcServer server = (SilcServer)ctx->server;
1379 SilcSocketConnection sock = ctx->sock;
1380 SilcServerHBContext hb_context;
1381 SilcUnknownEntry entry = (SilcUnknownEntry)sock->user_data;
1383 SilcUInt32 hearbeat_timeout = server->config->param.keepalive_secs;
1385 SILC_LOG_DEBUG(("Start"));
1387 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
1388 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
1389 /* Error occured during protocol */
1390 silc_protocol_free(protocol);
1391 sock->protocol = NULL;
1393 silc_packet_context_free(ctx->packet);
1395 silc_ske_free(ctx->ske);
1396 silc_free(ctx->dest_id);
1397 silc_server_config_unref(&ctx->cconfig);
1398 silc_server_config_unref(&ctx->sconfig);
1399 silc_server_config_unref(&ctx->rconfig);
1401 silc_schedule_task_del_by_callback(server->schedule,
1402 silc_server_failure_callback);
1403 silc_server_disconnect_remote(server, sock, "Server closed connection: "
1404 "Authentication failed");
1405 server->stat.auth_failures++;
1409 entry->data.last_receive = time(NULL);
1411 switch (ctx->conn_type) {
1412 case SILC_SOCKET_TYPE_CLIENT:
1414 SilcClientEntry client;
1415 SilcServerConfigClient *conn = ctx->cconfig.ref_ptr;
1417 /* Verify whether this connection is after all allowed to connect */
1418 if (!silc_server_connection_allowed(server, sock, ctx->conn_type,
1419 &server->config->param,
1420 conn->param, ctx->ske)) {
1421 server->stat.auth_failures++;
1425 SILC_LOG_DEBUG(("Remote host is client"));
1426 SILC_LOG_INFO(("Connection %s (%s) is client", sock->hostname,
1429 /* Add the client to the client ID cache. The nickname and Client ID
1430 and other information is created after we have received NEW_CLIENT
1431 packet from client. */
1432 client = silc_idlist_add_client(server->local_list,
1433 NULL, NULL, NULL, NULL, NULL, sock, 0);
1435 SILC_LOG_ERROR(("Could not add new client to cache"));
1436 silc_free(sock->user_data);
1437 silc_server_disconnect_remote(server, sock,
1438 "Server closed connection: "
1439 "Authentication failed");
1440 server->stat.auth_failures++;
1445 server->stat.my_clients++;
1446 server->stat.clients++;
1447 server->stat.cell_clients++;
1449 /* Get connection parameters */
1451 if (conn->param->keepalive_secs)
1452 hearbeat_timeout = conn->param->keepalive_secs;
1455 id_entry = (void *)client;
1458 case SILC_SOCKET_TYPE_SERVER:
1459 case SILC_SOCKET_TYPE_ROUTER:
1461 SilcServerEntry new_server;
1462 bool initiator = FALSE;
1463 bool backup_local = FALSE;
1464 bool backup_router = FALSE;
1465 char *backup_replace_ip = NULL;
1466 SilcUInt16 backup_replace_port = 0;
1467 SilcServerConfigServer *sconn = ctx->sconfig.ref_ptr;
1468 SilcServerConfigRouter *rconn = ctx->rconfig.ref_ptr;
1470 if (ctx->conn_type == SILC_SOCKET_TYPE_ROUTER) {
1471 /* Verify whether this connection is after all allowed to connect */
1472 if (!silc_server_connection_allowed(server, sock, ctx->conn_type,
1473 &server->config->param,
1474 rconn ? rconn->param : NULL,
1476 server->stat.auth_failures++;
1482 if (rconn->param->keepalive_secs)
1483 hearbeat_timeout = rconn->param->keepalive_secs;
1486 initiator = rconn->initiator;
1487 backup_local = rconn->backup_local;
1488 backup_router = rconn->backup_router;
1489 backup_replace_ip = rconn->backup_replace_ip;
1490 backup_replace_port = rconn->backup_replace_port;
1494 if (ctx->conn_type == SILC_SOCKET_TYPE_SERVER) {
1495 /* Verify whether this connection is after all allowed to connect */
1496 if (!silc_server_connection_allowed(server, sock, ctx->conn_type,
1497 &server->config->param,
1498 sconn ? sconn->param : NULL,
1500 server->stat.auth_failures++;
1505 if (sconn->param->keepalive_secs)
1506 hearbeat_timeout = sconn->param->keepalive_secs;
1509 backup_router = sconn->backup_router;
1513 SILC_LOG_DEBUG(("Remote host is %s",
1514 ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
1515 "server" : (backup_router ?
1516 "backup router" : "router")));
1517 SILC_LOG_INFO(("Connection %s (%s) is %s", sock->hostname,
1518 sock->ip, ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
1519 "server" : (backup_router ?
1520 "backup router" : "router")));
1522 /* Add the server into server cache. The server name and Server ID
1523 is updated after we have received NEW_SERVER packet from the
1524 server. We mark ourselves as router for this server if we really
1527 silc_idlist_add_server((ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
1528 server->local_list : (backup_router ?
1529 server->local_list :
1530 server->global_list)),
1532 (ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
1533 SILC_SERVER : SILC_ROUTER),
1535 (ctx->conn_type == SILC_SOCKET_TYPE_SERVER ?
1536 server->id_entry : (backup_router ?
1537 server->id_entry : NULL)),
1540 SILC_LOG_ERROR(("Could not add new server to cache"));
1541 silc_free(sock->user_data);
1542 silc_server_disconnect_remote(server, sock,
1543 "Server closed connection: "
1544 "Authentication failed");
1545 server->stat.auth_failures++;
1550 if (ctx->conn_type == SILC_SOCKET_TYPE_SERVER)
1551 server->stat.my_servers++;
1553 server->stat.my_routers++;
1554 server->stat.servers++;
1556 id_entry = (void *)new_server;
1558 /* If the incoming connection is router and marked as backup router
1559 then add it to be one of our backups */
1560 if (ctx->conn_type == SILC_SOCKET_TYPE_ROUTER && backup_router) {
1561 silc_server_backup_add(server, new_server, backup_replace_ip,
1562 backup_replace_port, backup_local);
1564 /* Change it back to SERVER type since that's what it really is. */
1566 ctx->conn_type = SILC_SOCKET_TYPE_SERVER;
1568 new_server->server_type = SILC_BACKUP_ROUTER;
1571 /* Check whether this connection is to be our primary router connection
1572 if we do not already have the primary route. */
1573 if (server->standalone && ctx->conn_type == SILC_SOCKET_TYPE_ROUTER) {
1574 if (silc_server_config_is_primary_route(server) && !initiator)
1577 SILC_LOG_DEBUG(("We are not standalone server anymore"));
1578 server->standalone = FALSE;
1579 if (!server->id_entry->router) {
1580 server->id_entry->router = id_entry;
1581 server->router = id_entry;
1592 sock->type = ctx->conn_type;
1594 /* Add the common data structure to the ID entry. */
1595 silc_idlist_add_data(id_entry, (SilcIDListData)sock->user_data);
1597 /* Add to sockets internal pointer for fast referencing */
1598 silc_free(sock->user_data);
1599 sock->user_data = id_entry;
1601 /* Connection has been fully established now. Everything is ok. */
1602 SILC_LOG_DEBUG(("New connection authenticated"));
1604 /* Perform keepalive. The `hb_context' will be freed automatically
1605 when finally calling the silc_socket_free function. */
1606 hb_context = silc_calloc(1, sizeof(*hb_context));
1607 hb_context->server = server;
1608 silc_socket_set_heartbeat(sock, hearbeat_timeout, hb_context,
1609 silc_server_perform_heartbeat,
1613 silc_schedule_task_del_by_callback(server->schedule,
1614 silc_server_failure_callback);
1615 silc_protocol_free(protocol);
1617 silc_packet_context_free(ctx->packet);
1619 silc_ske_free(ctx->ske);
1620 silc_free(ctx->dest_id);
1621 silc_server_config_unref(&ctx->cconfig);
1622 silc_server_config_unref(&ctx->sconfig);
1623 silc_server_config_unref(&ctx->rconfig);
1625 sock->protocol = NULL;
1628 /* This function is used to read packets from network and send packets to
1629 network. This is usually a generic task. */
1631 SILC_TASK_CALLBACK(silc_server_packet_process)
1633 SilcServer server = (SilcServer)context;
1634 SilcSocketConnection sock = server->sockets[fd];
1635 SilcIDListData idata;
1636 SilcCipher cipher = NULL;
1637 SilcHmac hmac = NULL;
1638 SilcUInt32 sequence = 0;
1644 SILC_LOG_DEBUG(("Processing packet"));
1646 /* Packet sending */
1648 if (type == SILC_TASK_WRITE) {
1649 /* Do not send data to disconnected connection */
1650 if (SILC_IS_DISCONNECTED(sock))
1653 server->stat.packets_sent++;
1655 /* Send the packet */
1656 ret = silc_packet_send(sock, TRUE);
1658 /* If returned -2 could not write to connection now, will do
1664 SILC_LOG_ERROR(("Error sending packet to connection "
1665 "%s:%d [%s]", sock->hostname, sock->port,
1666 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
1667 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
1668 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
1673 /* The packet has been sent and now it is time to set the connection
1674 back to only for input. When there is again some outgoing data
1675 available for this connection it will be set for output as well.
1676 This call clears the output setting and sets it only for input. */
1677 SILC_SET_CONNECTION_FOR_INPUT(server->schedule, fd);
1678 SILC_UNSET_OUTBUF_PENDING(sock);
1680 silc_buffer_clear(sock->outbuf);
1684 /* Packet receiving */
1686 /* Read some data from connection */
1687 ret = silc_packet_receive(sock);
1691 SILC_LOG_ERROR(("Error receiving packet from connection "
1692 "%s:%d [%s] %s", sock->hostname, sock->port,
1693 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
1694 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
1695 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
1696 "Router"), strerror(errno)));
1702 SILC_LOG_DEBUG(("Read EOF"));
1704 /* If connection is disconnecting already we will finally
1705 close the connection */
1706 if (SILC_IS_DISCONNECTING(sock)) {
1707 if (sock->user_data)
1708 silc_server_free_sock_user_data(server, sock, NULL);
1709 silc_server_close_connection(server, sock);
1713 SILC_LOG_DEBUG(("Premature EOF from connection %d", sock->sock));
1714 SILC_SET_DISCONNECTING(sock);
1716 if (sock->user_data) {
1718 if (silc_socket_get_error(sock, tmp, sizeof(tmp) - 1))
1719 silc_server_free_sock_user_data(server, sock, tmp);
1721 silc_server_free_sock_user_data(server, sock, NULL);
1722 } else if (server->router_conn && server->router_conn->sock == sock &&
1723 !server->router && server->standalone)
1724 silc_schedule_task_add(server->schedule, 0,
1725 silc_server_connect_to_router,
1728 SILC_TASK_PRI_NORMAL);
1730 silc_server_close_connection(server, sock);
1734 /* If connection is disconnecting or disconnected we will ignore
1736 if (SILC_IS_DISCONNECTING(sock) || SILC_IS_DISCONNECTED(sock)) {
1737 SILC_LOG_DEBUG(("Ignoring read data from disconnected connection"));
1741 server->stat.packets_received++;
1743 /* Get keys and stuff from ID entry */
1744 idata = (SilcIDListData)sock->user_data;
1746 cipher = idata->receive_key;
1747 hmac = idata->hmac_receive;
1748 sequence = idata->psn_receive;
1751 /* Process the packet. This will call the parser that will then
1752 decrypt and parse the packet. */
1753 ret = silc_packet_receive_process(sock, server->server_type == SILC_ROUTER ?
1754 TRUE : FALSE, cipher, hmac, sequence,
1755 silc_server_packet_parse, server);
1757 /* If this socket connection is not authenticated yet and the packet
1758 processing failed we will drop the connection since it can be
1759 a malicious flooder. */
1760 if (sock->type == SILC_SOCKET_TYPE_UNKNOWN && ret == FALSE &&
1761 (!sock->protocol || sock->protocol->protocol->type ==
1762 SILC_PROTOCOL_SERVER_KEY_EXCHANGE)) {
1763 SILC_LOG_DEBUG(("Bad data sent from unknown connection %d", sock->sock));
1764 SILC_SET_DISCONNECTING(sock);
1766 if (sock->user_data)
1767 silc_server_free_sock_user_data(server, sock, NULL);
1768 silc_server_close_connection(server, sock);
1772 /* Parses whole packet, received earlier. */
1774 SILC_TASK_CALLBACK(silc_server_packet_parse_real)
1776 SilcPacketParserContext *parse_ctx = (SilcPacketParserContext *)context;
1777 SilcServer server = (SilcServer)parse_ctx->context;
1778 SilcSocketConnection sock = parse_ctx->sock;
1779 SilcPacketContext *packet = parse_ctx->packet;
1780 SilcIDListData idata = (SilcIDListData)sock->user_data;
1783 SILC_LOG_DEBUG(("Start"));
1785 /* Parse the packet */
1786 if (parse_ctx->normal)
1787 ret = silc_packet_parse(packet, idata ? idata->receive_key : NULL);
1789 ret = silc_packet_parse_special(packet, idata ? idata->receive_key : NULL);
1791 /* If entry is disabled ignore what we got. */
1792 if (ret != SILC_PACKET_RESUME_ROUTER &&
1793 idata && idata->status & SILC_IDLIST_STATUS_DISABLED) {
1794 SILC_LOG_DEBUG(("Connection is disabled"));
1798 if (ret == SILC_PACKET_NONE)
1801 /* Check that the the current client ID is same as in the client's packet. */
1802 if (sock->type == SILC_SOCKET_TYPE_CLIENT) {
1803 SilcClientEntry client = (SilcClientEntry)sock->user_data;
1804 if (client && client->id) {
1805 void *id = silc_id_str2id(packet->src_id, packet->src_id_len,
1806 packet->src_id_type);
1807 if (!id || !SILC_ID_CLIENT_COMPARE(client->id, id)) {
1815 if (server->server_type == SILC_ROUTER) {
1816 /* Route the packet if it is not destined to us. Other ID types but
1817 server are handled separately after processing them. */
1818 if (!(packet->flags & SILC_PACKET_FLAG_BROADCAST) &&
1819 packet->dst_id_type == SILC_ID_SERVER &&
1820 sock->type != SILC_SOCKET_TYPE_CLIENT &&
1821 memcmp(packet->dst_id, server->id_string, server->id_string_len)) {
1823 /* Route the packet to fastest route for the destination ID */
1824 void *id = silc_id_str2id(packet->dst_id, packet->dst_id_len,
1825 packet->dst_id_type);
1828 silc_server_packet_route(server,
1829 silc_server_route_get(server, id,
1830 packet->dst_id_type),
1837 /* Parse the incoming packet type */
1838 silc_server_packet_parse_type(server, sock, packet);
1840 if (server->server_type == SILC_ROUTER) {
1841 /* Broadcast packet if it is marked as broadcast packet and it is
1842 originated from router and we are router. */
1843 if (sock->type == SILC_SOCKET_TYPE_ROUTER &&
1844 packet->flags & SILC_PACKET_FLAG_BROADCAST &&
1845 !server->standalone) {
1846 /* Broadcast to our primary route */
1847 silc_server_packet_broadcast(server, server->router->connection, packet);
1849 /* If we have backup routers then we need to feed all broadcast
1850 data to those servers. */
1851 silc_server_backup_broadcast(server, sock, packet);
1856 silc_packet_context_free(packet);
1857 silc_free(parse_ctx);
1860 /* Parser callback called by silc_packet_receive_process. This merely
1861 registers timeout that will handle the actual parsing when appropriate. */
1863 bool silc_server_packet_parse(SilcPacketParserContext *parser_context,
1866 SilcServer server = (SilcServer)context;
1867 SilcSocketConnection sock = parser_context->sock;
1868 SilcIDListData idata = (SilcIDListData)sock->user_data;
1871 idata->psn_receive = parser_context->packet->sequence + 1;
1873 /* If protocol for this connection is key exchange or rekey then we'll
1874 process all packets synchronously, since there might be packets in
1875 queue that we are not able to decrypt without first processing the
1876 packets before them. */
1877 if ((parser_context->packet->type == SILC_PACKET_REKEY ||
1878 parser_context->packet->type == SILC_PACKET_REKEY_DONE) ||
1879 (sock->protocol && sock->protocol->protocol &&
1880 (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
1881 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY))) {
1882 silc_server_packet_parse_real(server->schedule, 0, sock->sock,
1885 /* Reprocess data since we'll return FALSE here. This is because
1886 the idata->receive_key might have become valid in the last packet
1887 and we want to call this processor with valid cipher. */
1889 silc_packet_receive_process(sock, server->server_type == SILC_ROUTER ?
1890 TRUE : FALSE, idata->receive_key,
1891 idata->hmac_receive, idata->psn_receive,
1892 silc_server_packet_parse, server);
1894 silc_packet_receive_process(sock, server->server_type == SILC_ROUTER ?
1895 TRUE : FALSE, NULL, NULL, 0,
1896 silc_server_packet_parse, server);
1900 switch (sock->type) {
1901 case SILC_SOCKET_TYPE_UNKNOWN:
1902 case SILC_SOCKET_TYPE_CLIENT:
1903 /* Parse the packet with timeout */
1904 silc_schedule_task_add(server->schedule, sock->sock,
1905 silc_server_packet_parse_real,
1906 (void *)parser_context, 0, 100000,
1908 SILC_TASK_PRI_NORMAL);
1910 case SILC_SOCKET_TYPE_SERVER:
1911 case SILC_SOCKET_TYPE_ROUTER:
1912 /* Packets from servers are parsed immediately */
1913 silc_server_packet_parse_real(server->schedule, 0, sock->sock,
1923 /* Parses the packet type and calls what ever routines the packet type
1924 requires. This is done for all incoming packets. */
1926 void silc_server_packet_parse_type(SilcServer server,
1927 SilcSocketConnection sock,
1928 SilcPacketContext *packet)
1930 SilcPacketType type = packet->type;
1931 SilcIDListData idata = (SilcIDListData)sock->user_data;
1933 SILC_LOG_DEBUG(("Parsing packet type %d", type));
1935 /* Parse the packet type */
1937 case SILC_PACKET_DISCONNECT:
1938 SILC_LOG_DEBUG(("Disconnect packet"));
1939 if (packet->flags & SILC_PACKET_FLAG_LIST)
1941 if (silc_string_is_ascii(packet->buffer->data, packet->buffer->len)) {
1942 /* Duplicate to null terminate the string. */
1943 char *message = silc_memdup(packet->buffer->data, packet->buffer->len);
1944 SILC_LOG_ERROR(("%s", message));
1949 case SILC_PACKET_SUCCESS:
1951 * Success received for something. For now we can have only
1952 * one protocol for connection executing at once hence this
1953 * success message is for whatever protocol is executing currently.
1955 SILC_LOG_DEBUG(("Success packet"));
1956 if (packet->flags & SILC_PACKET_FLAG_LIST)
1959 silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
1962 case SILC_PACKET_FAILURE:
1964 * Failure received for something. For now we can have only
1965 * one protocol for connection executing at once hence this
1966 * failure message is for whatever protocol is executing currently.
1968 SILC_LOG_DEBUG(("Failure packet"));
1969 if (packet->flags & SILC_PACKET_FLAG_LIST)
1971 if (sock->protocol) {
1972 SilcServerFailureContext f;
1973 f = silc_calloc(1, sizeof(*f));
1977 /* We will wait 5 seconds to process this failure packet */
1978 silc_schedule_task_add(server->schedule, sock->sock,
1979 silc_server_failure_callback, (void *)f, 5, 0,
1980 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
1984 case SILC_PACKET_REJECT:
1985 SILC_LOG_DEBUG(("Reject packet"));
1986 if (packet->flags & SILC_PACKET_FLAG_LIST)
1991 case SILC_PACKET_NOTIFY:
1993 * Received notify packet. Server can receive notify packets from
1994 * router. Server then relays the notify messages to clients if needed.
1996 SILC_LOG_DEBUG(("Notify packet"));
1997 if (packet->flags & SILC_PACKET_FLAG_LIST)
1998 silc_server_notify_list(server, sock, packet);
2000 silc_server_notify(server, sock, packet);
2006 case SILC_PACKET_CHANNEL_MESSAGE:
2008 * Received channel message. Channel messages are special packets
2009 * (although probably most common ones) thus they are handled
2012 SILC_LOG_DEBUG(("Channel Message packet"));
2013 if (packet->flags & SILC_PACKET_FLAG_LIST)
2015 idata->last_receive = time(NULL);
2016 silc_server_channel_message(server, sock, packet);
2019 case SILC_PACKET_CHANNEL_KEY:
2021 * Received key for channel. As channels are created by the router
2022 * the keys are as well. We will distribute the key to all of our
2023 * locally connected clients on the particular channel. Router
2024 * never receives this channel and thus is ignored.
2026 SILC_LOG_DEBUG(("Channel Key packet"));
2027 if (packet->flags & SILC_PACKET_FLAG_LIST)
2029 silc_server_channel_key(server, sock, packet);
2035 case SILC_PACKET_COMMAND:
2037 * Recived command. Processes the command request and allocates the
2038 * command context and calls the command.
2040 SILC_LOG_DEBUG(("Command packet"));
2041 if (packet->flags & SILC_PACKET_FLAG_LIST)
2043 silc_server_command_process(server, sock, packet);
2046 case SILC_PACKET_COMMAND_REPLY:
2048 * Received command reply packet. Received command reply to command. It
2049 * may be reply to command sent by us or reply to command sent by client
2050 * that we've routed further.
2052 SILC_LOG_DEBUG(("Command Reply packet"));
2053 if (packet->flags & SILC_PACKET_FLAG_LIST)
2055 silc_server_command_reply(server, sock, packet);
2059 * Private Message packets
2061 case SILC_PACKET_PRIVATE_MESSAGE:
2063 * Received private message packet. The packet is coming from either
2066 SILC_LOG_DEBUG(("Private Message packet"));
2067 if (packet->flags & SILC_PACKET_FLAG_LIST)
2069 idata->last_receive = time(NULL);
2070 silc_server_private_message(server, sock, packet);
2073 case SILC_PACKET_PRIVATE_MESSAGE_KEY:
2075 * Private message key packet.
2077 if (packet->flags & SILC_PACKET_FLAG_LIST)
2079 silc_server_private_message_key(server, sock, packet);
2083 * Key Exchange protocol packets
2085 case SILC_PACKET_KEY_EXCHANGE:
2086 SILC_LOG_DEBUG(("KE packet"));
2087 if (packet->flags & SILC_PACKET_FLAG_LIST)
2090 if (sock->protocol && sock->protocol->protocol &&
2091 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE) {
2092 SilcServerKEInternalContext *proto_ctx =
2093 (SilcServerKEInternalContext *)sock->protocol->context;
2095 proto_ctx->packet = silc_packet_context_dup(packet);
2097 /* Let the protocol handle the packet */
2098 silc_protocol_execute(sock->protocol, server->schedule, 0, 100000);
2100 SILC_LOG_ERROR(("Received Key Exchange packet but no key exchange "
2101 "protocol active, packet dropped."));
2105 case SILC_PACKET_KEY_EXCHANGE_1:
2106 SILC_LOG_DEBUG(("KE 1 packet"));
2107 if (packet->flags & SILC_PACKET_FLAG_LIST)
2110 if (sock->protocol && sock->protocol->protocol &&
2111 (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
2112 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
2114 if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2115 SilcServerRekeyInternalContext *proto_ctx =
2116 (SilcServerRekeyInternalContext *)sock->protocol->context;
2118 if (proto_ctx->packet)
2119 silc_packet_context_free(proto_ctx->packet);
2121 proto_ctx->packet = silc_packet_context_dup(packet);
2123 /* Let the protocol handle the packet */
2124 silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2126 SilcServerKEInternalContext *proto_ctx =
2127 (SilcServerKEInternalContext *)sock->protocol->context;
2129 if (proto_ctx->packet)
2130 silc_packet_context_free(proto_ctx->packet);
2132 proto_ctx->packet = silc_packet_context_dup(packet);
2133 proto_ctx->dest_id_type = packet->src_id_type;
2134 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
2135 packet->src_id_type);
2136 if (!proto_ctx->dest_id)
2139 /* Let the protocol handle the packet */
2140 silc_protocol_execute(sock->protocol, server->schedule,
2144 SILC_LOG_ERROR(("Received Key Exchange 1 packet but no key exchange "
2145 "protocol active, packet dropped."));
2149 case SILC_PACKET_KEY_EXCHANGE_2:
2150 SILC_LOG_DEBUG(("KE 2 packet"));
2151 if (packet->flags & SILC_PACKET_FLAG_LIST)
2154 if (sock->protocol && sock->protocol->protocol &&
2155 (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_KEY_EXCHANGE ||
2156 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY)) {
2158 if (sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2159 SilcServerRekeyInternalContext *proto_ctx =
2160 (SilcServerRekeyInternalContext *)sock->protocol->context;
2162 if (proto_ctx->packet)
2163 silc_packet_context_free(proto_ctx->packet);
2165 proto_ctx->packet = silc_packet_context_dup(packet);
2167 /* Let the protocol handle the packet */
2168 silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2170 SilcServerKEInternalContext *proto_ctx =
2171 (SilcServerKEInternalContext *)sock->protocol->context;
2173 if (proto_ctx->packet)
2174 silc_packet_context_free(proto_ctx->packet);
2176 proto_ctx->packet = silc_packet_context_dup(packet);
2177 proto_ctx->dest_id_type = packet->src_id_type;
2178 proto_ctx->dest_id = silc_id_str2id(packet->src_id, packet->src_id_len,
2179 packet->src_id_type);
2180 if (!proto_ctx->dest_id)
2183 /* Let the protocol handle the packet */
2184 silc_protocol_execute(sock->protocol, server->schedule,
2188 SILC_LOG_ERROR(("Received Key Exchange 2 packet but no key exchange "
2189 "protocol active, packet dropped."));
2193 case SILC_PACKET_CONNECTION_AUTH_REQUEST:
2195 * Connection authentication request packet. When we receive this packet
2196 * we will send to the other end information about our mandatory
2197 * authentication method for the connection. This packet maybe received
2200 SILC_LOG_DEBUG(("Connection authentication request packet"));
2201 if (packet->flags & SILC_PACKET_FLAG_LIST)
2203 silc_server_connection_auth_request(server, sock, packet);
2207 * Connection Authentication protocol packets
2209 case SILC_PACKET_CONNECTION_AUTH:
2210 /* Start of the authentication protocol. We receive here the
2211 authentication data and will verify it. */
2212 SILC_LOG_DEBUG(("Connection auth packet"));
2213 if (packet->flags & SILC_PACKET_FLAG_LIST)
2216 if (sock->protocol && sock->protocol->protocol->type
2217 == SILC_PROTOCOL_SERVER_CONNECTION_AUTH) {
2219 SilcServerConnAuthInternalContext *proto_ctx =
2220 (SilcServerConnAuthInternalContext *)sock->protocol->context;
2222 proto_ctx->packet = silc_packet_context_dup(packet);
2224 /* Let the protocol handle the packet */
2225 silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2227 SILC_LOG_ERROR(("Received Connection Auth packet but no authentication "
2228 "protocol active, packet dropped."));
2232 case SILC_PACKET_NEW_ID:
2234 * Received New ID packet. This includes some new ID that has been
2235 * created. It may be for client, server or channel. This is the way
2236 * to distribute information about new registered entities in the
2239 SILC_LOG_DEBUG(("New ID packet"));
2240 if (packet->flags & SILC_PACKET_FLAG_LIST)
2241 silc_server_new_id_list(server, sock, packet);
2243 silc_server_new_id(server, sock, packet);
2246 case SILC_PACKET_NEW_CLIENT:
2248 * Received new client packet. This includes client information that
2249 * we will use to create initial client ID. After creating new
2250 * ID we will send it to the client.
2252 SILC_LOG_DEBUG(("New Client packet"));
2253 if (packet->flags & SILC_PACKET_FLAG_LIST)
2255 silc_server_new_client(server, sock, packet);
2258 case SILC_PACKET_NEW_SERVER:
2260 * Received new server packet. This includes Server ID and some other
2261 * information that we may save. This is received after server has
2264 SILC_LOG_DEBUG(("New Server packet"));
2265 if (packet->flags & SILC_PACKET_FLAG_LIST)
2267 silc_server_new_server(server, sock, packet);
2270 case SILC_PACKET_NEW_CHANNEL:
2272 * Received new channel packet. Information about new channel in the
2273 * network are distributed using this packet.
2275 SILC_LOG_DEBUG(("New Channel packet"));
2276 if (packet->flags & SILC_PACKET_FLAG_LIST)
2277 silc_server_new_channel_list(server, sock, packet);
2279 silc_server_new_channel(server, sock, packet);
2282 case SILC_PACKET_HEARTBEAT:
2284 * Received heartbeat.
2286 SILC_LOG_DEBUG(("Heartbeat packet"));
2287 if (packet->flags & SILC_PACKET_FLAG_LIST)
2291 case SILC_PACKET_KEY_AGREEMENT:
2293 * Received heartbeat.
2295 SILC_LOG_DEBUG(("Key agreement packet"));
2296 if (packet->flags & SILC_PACKET_FLAG_LIST)
2298 silc_server_key_agreement(server, sock, packet);
2301 case SILC_PACKET_REKEY:
2303 * Received re-key packet. The sender wants to regenerate the session
2306 SILC_LOG_DEBUG(("Re-key packet"));
2307 if (packet->flags & SILC_PACKET_FLAG_LIST)
2309 silc_server_rekey(server, sock, packet);
2312 case SILC_PACKET_REKEY_DONE:
2314 * The re-key is done.
2316 SILC_LOG_DEBUG(("Re-key done packet"));
2317 if (packet->flags & SILC_PACKET_FLAG_LIST)
2320 if (sock->protocol && sock->protocol->protocol &&
2321 sock->protocol->protocol->type == SILC_PROTOCOL_SERVER_REKEY) {
2323 SilcServerRekeyInternalContext *proto_ctx =
2324 (SilcServerRekeyInternalContext *)sock->protocol->context;
2326 if (proto_ctx->packet)
2327 silc_packet_context_free(proto_ctx->packet);
2329 proto_ctx->packet = silc_packet_context_dup(packet);
2331 /* Let the protocol handle the packet */
2332 silc_protocol_execute(sock->protocol, server->schedule, 0, 0);
2334 SILC_LOG_ERROR(("Received Re-key done packet but no re-key "
2335 "protocol active, packet dropped."));
2339 case SILC_PACKET_FTP:
2341 SILC_LOG_DEBUG(("FTP packet"));
2342 if (packet->flags & SILC_PACKET_FLAG_LIST)
2344 silc_server_ftp(server, sock, packet);
2347 case SILC_PACKET_RESUME_CLIENT:
2349 SILC_LOG_DEBUG(("Resume Client packet"));
2350 if (packet->flags & SILC_PACKET_FLAG_LIST)
2352 silc_server_resume_client(server, sock, packet);
2355 case SILC_PACKET_RESUME_ROUTER:
2356 /* Resume router packet received. This packet is received for backup
2357 router resuming protocol. */
2358 SILC_LOG_DEBUG(("Resume router packet"));
2359 if (packet->flags & SILC_PACKET_FLAG_LIST)
2361 silc_server_backup_resume_router(server, sock, packet);
2365 SILC_LOG_ERROR(("Incorrect packet type %d, packet dropped", type));
2371 /* Creates connection to a remote router. */
2373 void silc_server_create_connection(SilcServer server,
2374 const char *remote_host, SilcUInt32 port)
2376 SilcServerConnection sconn;
2378 /* Allocate connection object for hold connection specific stuff. */
2379 sconn = silc_calloc(1, sizeof(*sconn));
2380 sconn->server = server;
2381 sconn->remote_host = strdup(remote_host);
2382 sconn->remote_port = port;
2383 sconn->no_reconnect = TRUE;
2385 silc_schedule_task_add(server->schedule, 0,
2386 silc_server_connect_router,
2387 (void *)sconn, 0, 1, SILC_TASK_TIMEOUT,
2388 SILC_TASK_PRI_NORMAL);
2391 SILC_TASK_CALLBACK(silc_server_close_connection_final)
2393 silc_socket_free((SilcSocketConnection)context);
2396 /* Closes connection to socket connection */
2398 void silc_server_close_connection(SilcServer server,
2399 SilcSocketConnection sock)
2401 if (!server->sockets[sock->sock])
2404 SILC_LOG_INFO(("Closing connection %s:%d [%s]", sock->hostname,
2406 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
2407 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
2408 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
2411 /* We won't listen for this connection anymore */
2412 silc_schedule_unset_listen_fd(server->schedule, sock->sock);
2414 /* Unregister all tasks */
2415 silc_schedule_task_del_by_fd(server->schedule, sock->sock);
2417 /* Close the actual connection */
2418 silc_net_close_connection(sock->sock);
2419 server->sockets[sock->sock] = NULL;
2421 /* If sock->user_data is NULL then we'll check for active protocols
2422 here since the silc_server_free_sock_user_data has not been called
2423 for this connection. */
2424 if (!sock->user_data) {
2425 /* If any protocol is active cancel its execution. It will call
2426 the final callback which will finalize the disconnection. */
2427 if (sock->protocol) {
2428 silc_protocol_cancel(sock->protocol, server->schedule);
2429 sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
2430 silc_protocol_execute_final(sock->protocol, server->schedule);
2431 sock->protocol = NULL;
2436 silc_schedule_task_add(server->schedule, 0,
2437 silc_server_close_connection_final,
2438 (void *)sock, 0, 1, SILC_TASK_TIMEOUT,
2439 SILC_TASK_PRI_NORMAL);
2442 /* Sends disconnect message to remote connection and disconnects the
2445 void silc_server_disconnect_remote(SilcServer server,
2446 SilcSocketConnection sock,
2447 const char *fmt, ...)
2450 unsigned char buf[4096];
2455 memset(buf, 0, sizeof(buf));
2457 vsprintf(buf, fmt, ap);
2460 SILC_LOG_DEBUG(("Disconnecting remote host"));
2462 /* Notify remote end that the conversation is over. The notify message
2463 is tried to be sent immediately. */
2464 silc_server_packet_send(server, sock, SILC_PACKET_DISCONNECT, 0,
2465 buf, strlen(buf), TRUE);
2466 silc_server_packet_queue_purge(server, sock);
2468 /* Mark the connection to be disconnected */
2469 SILC_SET_DISCONNECTED(sock);
2470 silc_server_close_connection(server, sock);
2475 SilcClientEntry client;
2476 } *FreeClientInternal;
2478 SILC_TASK_CALLBACK(silc_server_free_client_data_timeout)
2480 FreeClientInternal i = (FreeClientInternal)context;
2482 silc_idlist_del_data(i->client);
2483 silc_idcache_purge_by_context(i->server->local_list->clients, i->client);
2487 /* Frees client data and notifies about client's signoff. */
2489 void silc_server_free_client_data(SilcServer server,
2490 SilcSocketConnection sock,
2491 SilcClientEntry client,
2493 const char *signoff)
2495 FreeClientInternal i = silc_calloc(1, sizeof(*i));
2497 /* If there is pending outgoing data for the client then purge it
2498 to the network before removing the client entry. */
2499 silc_server_packet_queue_purge(server, sock);
2504 /* Send SIGNOFF notify to routers. */
2505 if (notify && !server->standalone && server->router)
2506 silc_server_send_notify_signoff(server, server->router->connection,
2507 server->server_type == SILC_SERVER ?
2508 FALSE : TRUE, client->id, signoff);
2510 /* Remove client from all channels */
2512 silc_server_remove_from_channels(server, NULL, client,
2513 TRUE, (char *)signoff, TRUE);
2515 silc_server_remove_from_channels(server, NULL, client,
2516 FALSE, NULL, FALSE);
2518 /* Check if anyone is watching this nickname */
2519 if (server->server_type == SILC_ROUTER)
2520 silc_server_check_watcher_list(server, client, NULL,
2521 SILC_NOTIFY_TYPE_SIGNOFF);
2523 /* Remove this client from watcher list if it is */
2524 silc_server_del_from_watcher_list(server, client);
2526 /* Update statistics */
2527 server->stat.my_clients--;
2528 server->stat.clients--;
2529 if (server->stat.cell_clients)
2530 server->stat.cell_clients--;
2531 SILC_OPER_STATS_UPDATE(client, server, SILC_UMODE_SERVER_OPERATOR);
2532 SILC_OPER_STATS_UPDATE(client, router, SILC_UMODE_ROUTER_OPERATOR);
2533 silc_schedule_task_del_by_context(server->schedule, client);
2535 /* We will not delete the client entry right away. We will take it
2536 into history (for WHOWAS command) for 5 minutes */
2539 silc_schedule_task_add(server->schedule, 0,
2540 silc_server_free_client_data_timeout,
2542 SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
2543 client->data.status &= ~SILC_IDLIST_STATUS_REGISTERED;
2545 client->router = NULL;
2546 client->connection = NULL;
2549 /* Frees user_data pointer from socket connection object. This also sends
2550 appropriate notify packets to the network to inform about leaving
2553 void silc_server_free_sock_user_data(SilcServer server,
2554 SilcSocketConnection sock,
2555 const char *signoff_message)
2557 SILC_LOG_DEBUG(("Start"));
2559 switch (sock->type) {
2560 case SILC_SOCKET_TYPE_CLIENT:
2562 SilcClientEntry user_data = (SilcClientEntry)sock->user_data;
2563 silc_server_free_client_data(server, sock, user_data, TRUE,
2567 case SILC_SOCKET_TYPE_SERVER:
2568 case SILC_SOCKET_TYPE_ROUTER:
2570 SilcServerEntry user_data = (SilcServerEntry)sock->user_data;
2571 SilcServerEntry backup_router = NULL;
2574 backup_router = silc_server_backup_get(server, user_data->id);
2576 /* If this was our primary router connection then we're lost to
2577 the outside world. */
2578 if (server->router == user_data) {
2579 /* Check whether we have a backup router connection */
2580 if (!backup_router || backup_router == user_data) {
2581 silc_schedule_task_add(server->schedule, 0,
2582 silc_server_connect_to_router,
2585 SILC_TASK_PRI_NORMAL);
2587 server->id_entry->router = NULL;
2588 server->router = NULL;
2589 server->standalone = TRUE;
2590 backup_router = NULL;
2592 SILC_LOG_INFO(("New primary router is backup router %s",
2593 backup_router->server_name));
2594 SILC_LOG_DEBUG(("New primary router is backup router %s",
2595 backup_router->server_name));
2596 server->id_entry->router = backup_router;
2597 server->router = backup_router;
2598 server->router_connect = time(0);
2599 server->backup_primary = TRUE;
2600 if (server->server_type == SILC_BACKUP_ROUTER) {
2601 server->server_type = SILC_ROUTER;
2603 /* We'll need to constantly try to reconnect to the primary
2604 router so that we'll see when it comes back online. */
2605 silc_server_backup_reconnect(server, sock->ip, sock->port,
2606 silc_server_backup_connected,
2610 /* Mark this connection as replaced */
2611 silc_server_backup_replaced_add(server, user_data->id,
2614 } else if (backup_router) {
2615 SILC_LOG_INFO(("Enabling the use of backup router %s",
2616 backup_router->server_name));
2617 SILC_LOG_DEBUG(("Enabling the use of backup router %s",
2618 backup_router->server_name));
2620 /* Mark this connection as replaced */
2621 silc_server_backup_replaced_add(server, user_data->id,
2625 if (!backup_router) {
2626 /* Free all client entries that this server owns as they will
2627 become invalid now as well. */
2629 silc_server_remove_clients_by_server(server, user_data, TRUE);
2630 if (server->server_type == SILC_SERVER)
2631 silc_server_remove_channels_by_server(server, user_data);
2633 /* Update the client entries of this server to the new backup
2634 router. This also removes the clients that *really* was owned
2635 by the primary router and went down with the router. */
2636 silc_server_update_clients_by_server(server, user_data, backup_router,
2638 silc_server_update_servers_by_server(server, user_data, backup_router);
2639 if (server->server_type == SILC_SERVER)
2640 silc_server_update_channels_by_server(server, user_data,
2644 /* Free the server entry */
2645 silc_server_backup_del(server, user_data);
2646 silc_server_backup_replaced_del(server, user_data);
2647 silc_idlist_del_data(user_data);
2648 if (!silc_idlist_del_server(server->local_list, user_data))
2649 silc_idlist_del_server(server->global_list, user_data);
2650 server->stat.my_servers--;
2651 server->stat.servers--;
2652 if (server->server_type == SILC_ROUTER)
2653 server->stat.cell_servers--;
2655 if (backup_router) {
2656 /* Announce all of our stuff that was created about 5 minutes ago.
2657 The backup router knows all the other stuff already. */
2658 if (server->server_type == SILC_ROUTER)
2659 silc_server_announce_servers(server, FALSE, time(0) - 300,
2660 backup_router->connection);
2662 /* Announce our clients and channels to the router */
2663 silc_server_announce_clients(server, time(0) - 300,
2664 backup_router->connection);
2665 silc_server_announce_channels(server, time(0) - 300,
2666 backup_router->connection);
2672 SilcUnknownEntry user_data = (SilcUnknownEntry)sock->user_data;
2674 silc_idlist_del_data(user_data);
2675 silc_free(user_data);
2680 /* If any protocol is active cancel its execution */
2681 if (sock->protocol) {
2682 silc_protocol_cancel(sock->protocol, server->schedule);
2683 sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
2684 silc_protocol_execute_final(sock->protocol, server->schedule);
2685 sock->protocol = NULL;
2688 sock->user_data = NULL;
2691 /* Removes client from all channels it has joined. This is used when client
2692 connection is disconnected. If the client on a channel is last, the
2693 channel is removed as well. This sends the SIGNOFF notify types. */
2695 void silc_server_remove_from_channels(SilcServer server,
2696 SilcSocketConnection sock,
2697 SilcClientEntry client,
2699 char *signoff_message,
2702 SilcChannelEntry channel;
2703 SilcChannelClientEntry chl;
2704 SilcHashTableList htl;
2707 SILC_LOG_DEBUG(("Start"));
2709 if (!client || !client->id)
2712 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2714 /* Remove the client from all channels. The client is removed from
2715 the channels' user list. */
2716 silc_hash_table_list(client->channels, &htl);
2717 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
2718 channel = chl->channel;
2720 /* Remove channel from client's channel list */
2721 silc_hash_table_del(client->channels, channel);
2723 /* Remove channel if there is no users anymore */
2724 if (server->server_type == SILC_ROUTER &&
2725 silc_hash_table_count(channel->user_list) < 2) {
2727 silc_schedule_task_del_by_context(server->schedule, channel->rekey);
2728 if (silc_idlist_del_channel(server->local_list, channel))
2729 server->stat.my_channels--;
2731 silc_idlist_del_channel(server->global_list, channel);
2735 /* Remove client from channel's client list */
2736 silc_hash_table_del(channel->user_list, chl->client);
2737 channel->user_count--;
2739 /* If there is no global users on the channel anymore mark the channel
2740 as local channel. Do not check if the removed client is local client. */
2741 if (server->server_type != SILC_ROUTER && channel->global_users &&
2742 chl->client->router && !silc_server_channel_has_global(channel))
2743 channel->global_users = FALSE;
2746 server->stat.my_chanclients--;
2748 /* If there is not at least one local user on the channel then we don't
2749 need the channel entry anymore, we can remove it safely. */
2750 if (server->server_type != SILC_ROUTER &&
2751 !silc_server_channel_has_local(channel)) {
2752 /* Notify about leaving client if this channel has global users. */
2753 if (notify && channel->global_users)
2754 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2755 SILC_NOTIFY_TYPE_SIGNOFF,
2756 signoff_message ? 2 : 1,
2757 clidp->data, clidp->len,
2758 signoff_message, signoff_message ?
2759 strlen(signoff_message) : 0);
2762 silc_schedule_task_del_by_context(server->schedule, channel->rekey);
2764 if (channel->founder_key) {
2765 /* The founder auth data exists, do not remove the channel entry */
2766 SilcChannelClientEntry chl2;
2767 SilcHashTableList htl2;
2769 channel->disabled = TRUE;
2771 silc_hash_table_list(channel->user_list, &htl2);
2772 while (silc_hash_table_get(&htl2, NULL, (void *)&chl2)) {
2773 silc_hash_table_del(chl2->client->channels, channel);
2774 silc_hash_table_del(channel->user_list, chl2->client);
2775 channel->user_count--;
2778 silc_hash_table_list_reset(&htl2);
2782 /* Remove the channel entry */
2783 if (silc_idlist_del_channel(server->local_list, channel))
2784 server->stat.my_channels--;
2786 silc_idlist_del_channel(server->global_list, channel);
2790 /* Send notify to channel about client leaving SILC and thus
2791 the entire channel. */
2793 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2794 SILC_NOTIFY_TYPE_SIGNOFF,
2795 signoff_message ? 2 : 1,
2796 clidp->data, clidp->len,
2797 signoff_message, signoff_message ?
2798 strlen(signoff_message) : 0);
2800 if (keygen && !(channel->mode & SILC_CHANNEL_MODE_PRIVKEY)) {
2801 /* Re-generate channel key */
2802 if (!silc_server_create_channel_key(server, channel, 0))
2805 /* Send the channel key to the channel. The key of course is not sent
2806 to the client who was removed from the channel. */
2807 silc_server_send_channel_key(server, client->connection, channel,
2808 server->server_type == SILC_ROUTER ?
2809 FALSE : !server->standalone);
2814 silc_hash_table_list_reset(&htl);
2815 silc_buffer_free(clidp);
2818 /* Removes client from one channel. This is used for example when client
2819 calls LEAVE command to remove itself from the channel. Returns TRUE
2820 if channel still exists and FALSE if the channel is removed when
2821 last client leaves the channel. If `notify' is FALSE notify messages
2824 int silc_server_remove_from_one_channel(SilcServer server,
2825 SilcSocketConnection sock,
2826 SilcChannelEntry channel,
2827 SilcClientEntry client,
2830 SilcChannelClientEntry chl;
2833 SILC_LOG_DEBUG(("Start"));
2835 /* Get the entry to the channel, if this client is not on the channel
2837 if (!silc_hash_table_find(client->channels, channel, NULL, (void *)&chl))
2840 /* Remove the client from the channel. The client is removed from
2841 the channel's user list. */
2843 clidp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
2845 /* Remove channel from client's channel list */
2846 silc_hash_table_del(client->channels, chl->channel);
2848 /* Remove channel if there is no users anymore */
2849 if (server->server_type == SILC_ROUTER &&
2850 silc_hash_table_count(channel->user_list) < 2) {
2852 silc_schedule_task_del_by_context(server->schedule, channel->rekey);
2853 if (silc_idlist_del_channel(server->local_list, channel))
2854 server->stat.my_channels--;
2856 silc_idlist_del_channel(server->global_list, channel);
2857 silc_buffer_free(clidp);
2861 /* Remove client from channel's client list */
2862 silc_hash_table_del(channel->user_list, chl->client);
2863 channel->user_count--;
2865 /* If there is no global users on the channel anymore mark the channel
2866 as local channel. Do not check if the client is local client. */
2867 if (server->server_type != SILC_ROUTER && channel->global_users &&
2868 chl->client->router && !silc_server_channel_has_global(channel))
2869 channel->global_users = FALSE;
2872 server->stat.my_chanclients--;
2874 /* If there is not at least one local user on the channel then we don't
2875 need the channel entry anymore, we can remove it safely. */
2876 if (server->server_type != SILC_ROUTER &&
2877 !silc_server_channel_has_local(channel)) {
2878 /* Notify about leaving client if this channel has global users. */
2879 if (notify && channel->global_users)
2880 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2881 SILC_NOTIFY_TYPE_LEAVE, 1,
2882 clidp->data, clidp->len);
2884 silc_buffer_free(clidp);
2887 silc_schedule_task_del_by_context(server->schedule, channel->rekey);
2889 if (channel->founder_key) {
2890 /* The founder auth data exists, do not remove the channel entry */
2891 SilcChannelClientEntry chl2;
2892 SilcHashTableList htl2;
2894 channel->disabled = TRUE;
2896 silc_hash_table_list(channel->user_list, &htl2);
2897 while (silc_hash_table_get(&htl2, NULL, (void *)&chl2)) {
2898 silc_hash_table_del(chl2->client->channels, channel);
2899 silc_hash_table_del(channel->user_list, chl2->client);
2900 channel->user_count--;
2903 silc_hash_table_list_reset(&htl2);
2907 /* Remove the channel entry */
2908 if (silc_idlist_del_channel(server->local_list, channel))
2909 server->stat.my_channels--;
2911 silc_idlist_del_channel(server->global_list, channel);
2915 /* Send notify to channel about client leaving the channel */
2917 silc_server_send_notify_to_channel(server, NULL, channel, FALSE,
2918 SILC_NOTIFY_TYPE_LEAVE, 1,
2919 clidp->data, clidp->len);
2921 silc_buffer_free(clidp);
2925 /* Timeout callback. This is called if connection is idle or for some
2926 other reason is not responding within some period of time. This
2927 disconnects the remote end. */
2929 SILC_TASK_CALLBACK(silc_server_timeout_remote)
2931 SilcServer server = (SilcServer)context;
2932 SilcSocketConnection sock = server->sockets[fd];
2934 SILC_LOG_DEBUG(("Start"));
2939 SILC_LOG_ERROR(("No response from %s (%s), Connection timeout",
2940 sock->hostname, sock->ip));
2942 /* If we have protocol active we must assure that we call the protocol's
2943 final callback so that all the memory is freed. */
2944 if (sock->protocol) {
2945 silc_protocol_cancel(sock->protocol, server->schedule);
2946 sock->protocol->state = SILC_PROTOCOL_STATE_ERROR;
2947 silc_protocol_execute_final(sock->protocol, server->schedule);
2948 sock->protocol = NULL;
2952 if (sock->user_data)
2953 silc_server_free_sock_user_data(server, sock, NULL);
2955 silc_server_disconnect_remote(server, sock, "Server closed connection: "
2956 "Connection timeout");
2959 /* Creates new channel. Sends NEW_CHANNEL packet to primary route. This
2960 function may be used only by router. In real SILC network all channels
2961 are created by routers thus this function is never used by normal
2964 SilcChannelEntry silc_server_create_new_channel(SilcServer server,
2965 SilcServerID *router_id,
2971 SilcChannelID *channel_id;
2972 SilcChannelEntry entry;
2976 SILC_LOG_DEBUG(("Creating new channel"));
2979 cipher = SILC_DEFAULT_CIPHER;
2981 hmac = SILC_DEFAULT_HMAC;
2983 /* Allocate cipher */
2984 if (!silc_cipher_alloc(cipher, &key))
2988 if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
2989 silc_cipher_free(key);
2993 channel_name = strdup(channel_name);
2995 /* Create the channel ID */
2996 if (!silc_id_create_channel_id(server, router_id, server->rng,
2998 silc_free(channel_name);
2999 silc_cipher_free(key);
3000 silc_hmac_free(newhmac);
3004 /* Create the channel */
3005 entry = silc_idlist_add_channel(server->local_list, channel_name,
3006 SILC_CHANNEL_MODE_NONE, channel_id,
3007 NULL, key, newhmac, 0);
3009 silc_free(channel_name);
3010 silc_cipher_free(key);
3011 silc_hmac_free(newhmac);
3012 silc_free(channel_id);
3016 entry->cipher = strdup(cipher);
3017 entry->hmac_name = strdup(hmac);
3019 /* Now create the actual key material */
3020 if (!silc_server_create_channel_key(server, entry,
3021 silc_cipher_get_key_len(key) / 8)) {
3022 silc_idlist_del_channel(server->local_list, entry);
3026 /* Notify other routers about the new channel. We send the packet
3027 to our primary route. */
3028 if (broadcast && server->standalone == FALSE)
3029 silc_server_send_new_channel(server, server->router->connection, TRUE,
3030 channel_name, entry->id,
3031 silc_id_get_len(entry->id, SILC_ID_CHANNEL),
3034 server->stat.my_channels++;
3036 if (server->server_type == SILC_ROUTER)
3037 entry->users_resolved = TRUE;
3042 /* Same as above but creates the channel with Channel ID `channel_id. */
3045 silc_server_create_new_channel_with_id(SilcServer server,
3049 SilcChannelID *channel_id,
3052 SilcChannelEntry entry;
3056 SILC_LOG_DEBUG(("Creating new channel"));
3059 cipher = SILC_DEFAULT_CIPHER;
3061 hmac = SILC_DEFAULT_HMAC;
3063 /* Allocate cipher */
3064 if (!silc_cipher_alloc(cipher, &key))
3068 if (!silc_hmac_alloc(hmac, NULL, &newhmac)) {
3069 silc_cipher_free(key);
3073 channel_name = strdup(channel_name);
3075 /* Create the channel */
3076 entry = silc_idlist_add_channel(server->local_list, channel_name,
3077 SILC_CHANNEL_MODE_NONE, channel_id,
3078 NULL, key, newhmac, 0);
3080 silc_cipher_free(key);
3081 silc_hmac_free(newhmac);
3082 silc_free(channel_name);
3086 /* Now create the actual key material */
3087 if (!silc_server_create_channel_key(server, entry,
3088 silc_cipher_get_key_len(key) / 8)) {
3089 silc_idlist_del_channel(server->local_list, entry);
3093 /* Notify other routers about the new channel. We send the packet
3094 to our primary route. */
3095 if (broadcast && server->standalone == FALSE)
3096 silc_server_send_new_channel(server, server->router->connection, TRUE,
3097 channel_name, entry->id,
3098 silc_id_get_len(entry->id, SILC_ID_CHANNEL),
3101 server->stat.my_channels++;
3103 if (server->server_type == SILC_ROUTER)
3104 entry->users_resolved = TRUE;
3109 /* Channel's key re-key timeout callback. */
3111 SILC_TASK_CALLBACK(silc_server_channel_key_rekey)
3113 SilcServerChannelRekey rekey = (SilcServerChannelRekey)context;
3114 SilcServer server = (SilcServer)rekey->context;
3118 if (!silc_server_create_channel_key(server, rekey->channel, rekey->key_len))
3121 silc_server_send_channel_key(server, NULL, rekey->channel, FALSE);
3124 /* Generates new channel key. This is used to create the initial channel key
3125 but also to re-generate new key for channel. If `key_len' is provided
3126 it is the bytes of the key length. */
3128 bool silc_server_create_channel_key(SilcServer server,
3129 SilcChannelEntry channel,
3133 unsigned char channel_key[32], hash[32];
3136 SILC_LOG_DEBUG(("Generating channel key"));
3138 if (channel->mode & SILC_CHANNEL_MODE_PRIVKEY) {
3139 SILC_LOG_DEBUG(("Channel has private keys, will not generate new key"));
3143 if (!channel->channel_key)
3144 if (!silc_cipher_alloc(SILC_DEFAULT_CIPHER, &channel->channel_key)) {
3145 channel->channel_key = NULL;
3151 else if (channel->key_len)
3152 len = channel->key_len / 8;
3154 len = silc_cipher_get_key_len(channel->channel_key) / 8;
3156 /* Create channel key */
3157 for (i = 0; i < len; i++) channel_key[i] = silc_rng_get_byte(server->rng);
3160 silc_cipher_set_key(channel->channel_key, channel_key, len * 8);
3162 /* Remove old key if exists */
3164 memset(channel->key, 0, channel->key_len / 8);
3165 silc_free(channel->key);
3169 channel->key_len = len * 8;
3170 channel->key = silc_memdup(channel_key, len);
3171 memset(channel_key, 0, sizeof(channel_key));
3173 /* Generate HMAC key from the channel key data and set it */
3175 silc_hmac_alloc(SILC_DEFAULT_HMAC, NULL, &channel->hmac);
3176 silc_hash_make(silc_hmac_get_hash(channel->hmac), channel->key, len, hash);
3177 silc_hmac_set_key(channel->hmac, hash,
3178 silc_hash_len(silc_hmac_get_hash(channel->hmac)));
3179 memset(hash, 0, sizeof(hash));
3181 if (server->server_type == SILC_ROUTER) {
3182 if (!channel->rekey)
3183 channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
3184 channel->rekey->context = (void *)server;
3185 channel->rekey->channel = channel;
3186 channel->rekey->key_len = key_len;
3187 if (channel->rekey->task)
3188 silc_schedule_task_del(server->schedule, channel->rekey->task);
3190 channel->rekey->task =
3191 silc_schedule_task_add(server->schedule, 0,
3192 silc_server_channel_key_rekey,
3193 (void *)channel->rekey,
3194 server->config->channel_rekey_secs, 0,
3196 SILC_TASK_PRI_NORMAL);
3202 /* Saves the channel key found in the encoded `key_payload' buffer. This
3203 function is used when we receive Channel Key Payload and also when we're
3204 processing JOIN command reply. Returns entry to the channel. */
3206 SilcChannelEntry silc_server_save_channel_key(SilcServer server,
3207 SilcBuffer key_payload,
3208 SilcChannelEntry channel)
3210 SilcChannelKeyPayload payload = NULL;
3211 SilcChannelID *id = NULL;
3212 unsigned char *tmp, hash[32];
3216 SILC_LOG_DEBUG(("Start"));
3218 /* Decode channel key payload */
3219 payload = silc_channel_key_payload_parse(key_payload->data,
3222 SILC_LOG_ERROR(("Bad channel key payload received, dropped"));
3227 /* Get the channel entry */
3230 /* Get channel ID */
3231 tmp = silc_channel_key_get_id(payload, &tmp_len);
3232 id = silc_id_str2id(tmp, tmp_len, SILC_ID_CHANNEL);
3238 channel = silc_idlist_find_channel_by_id(server->local_list, id, NULL);
3240 channel = silc_idlist_find_channel_by_id(server->global_list, id, NULL);
3242 SILC_LOG_ERROR(("Received key for non-existent channel %s",
3243 silc_id_render(id, SILC_ID_CHANNEL)));
3249 tmp = silc_channel_key_get_key(payload, &tmp_len);
3255 cipher = silc_channel_key_get_cipher(payload, NULL);
3261 /* Remove old key if exists */
3263 memset(channel->key, 0, channel->key_len / 8);
3264 silc_free(channel->key);
3265 silc_cipher_free(channel->channel_key);
3268 /* Create new cipher */
3269 if (!silc_cipher_alloc(cipher, &channel->channel_key)) {
3270 channel->channel_key = NULL;
3275 if (channel->cipher)
3276 silc_free(channel->cipher);
3277 channel->cipher = strdup(cipher);
3280 channel->key_len = tmp_len * 8;
3281 channel->key = silc_memdup(tmp, tmp_len);
3282 silc_cipher_set_key(channel->channel_key, tmp, channel->key_len);
3284 /* Generate HMAC key from the channel key data and set it */
3286 silc_hmac_alloc(SILC_DEFAULT_HMAC, NULL, &channel->hmac);
3287 silc_hash_make(silc_hmac_get_hash(channel->hmac), tmp, tmp_len, hash);
3288 silc_hmac_set_key(channel->hmac, hash,
3289 silc_hash_len(silc_hmac_get_hash(channel->hmac)));
3291 memset(hash, 0, sizeof(hash));
3292 memset(tmp, 0, tmp_len);
3294 if (server->server_type == SILC_ROUTER) {
3295 if (!channel->rekey)
3296 channel->rekey = silc_calloc(1, sizeof(*channel->rekey));
3297 channel->rekey->context = (void *)server;
3298 channel->rekey->channel = channel;
3299 if (channel->rekey->task)
3300 silc_schedule_task_del(server->schedule, channel->rekey->task);
3302 channel->rekey->task =
3303 silc_schedule_task_add(server->schedule, 0,
3304 silc_server_channel_key_rekey,
3305 (void *)channel->rekey,
3306 server->config->channel_rekey_secs, 0,
3308 SILC_TASK_PRI_NORMAL);
3314 silc_channel_key_payload_free(payload);
3319 /* Heartbeat callback. This function is set as argument for the
3320 silc_socket_set_heartbeat function. The library will call this function
3321 at the set time interval. */
3323 void silc_server_perform_heartbeat(SilcSocketConnection sock,
3326 SilcServerHBContext hb = (SilcServerHBContext)hb_context;
3328 SILC_LOG_DEBUG(("Sending heartbeat to %s (%s)", sock->hostname, sock->ip));
3330 /* Send the heartbeat */
3331 silc_server_send_heartbeat(hb->server, sock);
3334 /* Returns assembled of all servers in the given ID list. The packet's
3335 form is dictated by the New ID payload. */
3337 static void silc_server_announce_get_servers(SilcServer server,
3338 SilcServerEntry remote,
3340 SilcBuffer *servers,
3341 unsigned long creation_time)
3343 SilcIDCacheList list;
3344 SilcIDCacheEntry id_cache;
3345 SilcServerEntry entry;
3348 /* Go through all clients in the list */
3349 if (silc_idcache_get_all(id_list->servers, &list)) {
3350 if (silc_idcache_list_first(list, &id_cache)) {
3352 entry = (SilcServerEntry)id_cache->context;
3354 /* Do not announce the one we've sending our announcements and
3355 do not announce ourself. Also check the creation time if it's
3357 if ((entry == remote) || (entry == server->id_entry) ||
3358 (creation_time && entry->data.created < creation_time)) {
3359 if (!silc_idcache_list_next(list, &id_cache))
3364 idp = silc_id_payload_encode(entry->id, SILC_ID_SERVER);
3366 *servers = silc_buffer_realloc(*servers,
3368 (*servers)->truelen + idp->len :
3370 silc_buffer_pull_tail(*servers, ((*servers)->end - (*servers)->data));
3371 silc_buffer_put(*servers, idp->data, idp->len);
3372 silc_buffer_pull(*servers, idp->len);
3373 silc_buffer_free(idp);
3375 if (!silc_idcache_list_next(list, &id_cache))
3380 silc_idcache_list_free(list);
3385 silc_server_announce_encode_notify(SilcNotifyType notify, SilcUInt32 argc, ...)
3391 p = silc_notify_payload_encode(notify, argc, ap);
3397 /* This function is used by router to announce existing servers to our
3398 primary router when we've connected to it. If `creation_time' is non-zero
3399 then only the servers that has been created after the `creation_time'
3400 will be announced. */
3402 void silc_server_announce_servers(SilcServer server, bool global,
3403 unsigned long creation_time,
3404 SilcSocketConnection remote)
3406 SilcBuffer servers = NULL;
3408 SILC_LOG_DEBUG(("Announcing servers"));
3410 /* Get servers in local list */
3411 silc_server_announce_get_servers(server, remote->user_data,
3412 server->local_list, &servers,
3416 /* Get servers in global list */
3417 silc_server_announce_get_servers(server, remote->user_data,
3418 server->global_list, &servers,
3422 silc_buffer_push(servers, servers->data - servers->head);
3423 SILC_LOG_HEXDUMP(("servers"), servers->data, servers->len);
3425 /* Send the packet */
3426 silc_server_packet_send(server, remote,
3427 SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
3428 servers->data, servers->len, TRUE);
3430 silc_buffer_free(servers);
3434 /* Returns assembled packet of all clients in the given ID list. The
3435 packet's form is dictated by the New ID Payload. */
3437 static void silc_server_announce_get_clients(SilcServer server,
3439 SilcBuffer *clients,
3441 unsigned long creation_time)
3443 SilcIDCacheList list;
3444 SilcIDCacheEntry id_cache;
3445 SilcClientEntry client;
3448 unsigned char mode[4];
3450 /* Go through all clients in the list */
3451 if (silc_idcache_get_all(id_list->clients, &list)) {
3452 if (silc_idcache_list_first(list, &id_cache)) {
3454 client = (SilcClientEntry)id_cache->context;
3456 if (creation_time && client->data.created < creation_time) {
3457 if (!silc_idcache_list_next(list, &id_cache))
3462 idp = silc_id_payload_encode(client->id, SILC_ID_CLIENT);
3464 *clients = silc_buffer_realloc(*clients,
3466 (*clients)->truelen + idp->len :
3468 silc_buffer_pull_tail(*clients, ((*clients)->end - (*clients)->data));
3469 silc_buffer_put(*clients, idp->data, idp->len);
3470 silc_buffer_pull(*clients, idp->len);
3472 SILC_PUT32_MSB(client->mode, mode);
3473 tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_UMODE_CHANGE,
3474 2, idp->data, idp->len,
3476 *umodes = silc_buffer_realloc(*umodes,
3478 (*umodes)->truelen + tmp->len :
3480 silc_buffer_pull_tail(*umodes, ((*umodes)->end - (*umodes)->data));
3481 silc_buffer_put(*umodes, tmp->data, tmp->len);
3482 silc_buffer_pull(*umodes, tmp->len);
3483 silc_buffer_free(tmp);
3485 silc_buffer_free(idp);
3487 if (!silc_idcache_list_next(list, &id_cache))
3492 silc_idcache_list_free(list);
3496 /* This function is used to announce our existing clients to our router
3497 when we've connected to it. If `creation_time' is non-zero then only
3498 the clients that has been created after the `creation_time' will be
3501 void silc_server_announce_clients(SilcServer server,
3502 unsigned long creation_time,
3503 SilcSocketConnection remote)
3505 SilcBuffer clients = NULL;
3506 SilcBuffer umodes = NULL;
3508 SILC_LOG_DEBUG(("Announcing clients"));
3510 /* Get clients in local list */
3511 silc_server_announce_get_clients(server, server->local_list,
3512 &clients, &umodes, creation_time);
3514 /* As router we announce our global list as well */
3515 if (server->server_type == SILC_ROUTER)
3516 silc_server_announce_get_clients(server, server->global_list,
3517 &clients, &umodes, creation_time);
3520 silc_buffer_push(clients, clients->data - clients->head);
3521 SILC_LOG_HEXDUMP(("clients"), clients->data, clients->len);
3523 /* Send the packet */
3524 silc_server_packet_send(server, remote,
3525 SILC_PACKET_NEW_ID, SILC_PACKET_FLAG_LIST,
3526 clients->data, clients->len, TRUE);
3528 silc_buffer_free(clients);
3532 silc_buffer_push(umodes, umodes->data - umodes->head);
3533 SILC_LOG_HEXDUMP(("umodes"), umodes->data, umodes->len);
3535 /* Send the packet */
3536 silc_server_packet_send(server, remote,
3537 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3538 umodes->data, umodes->len, TRUE);
3540 silc_buffer_free(umodes);
3544 /* Returns channel's topic for announcing it */
3546 void silc_server_announce_get_channel_topic(SilcServer server,
3547 SilcChannelEntry channel,
3552 if (channel->topic) {
3553 chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
3554 *topic = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_TOPIC_SET, 2,
3555 chidp->data, chidp->len,
3557 strlen(channel->topic));
3558 silc_buffer_free(chidp);
3562 /* Returns assembled packets for channel users of the `channel'. */
3564 void silc_server_announce_get_channel_users(SilcServer server,
3565 SilcChannelEntry channel,
3566 SilcBuffer *channel_users,
3567 SilcBuffer *channel_users_modes)
3569 SilcChannelClientEntry chl;
3570 SilcHashTableList htl;
3571 SilcBuffer chidp, clidp;
3574 unsigned char mode[4];
3576 SILC_LOG_DEBUG(("Start"));
3578 /* Now find all users on the channel */
3579 chidp = silc_id_payload_encode(channel->id, SILC_ID_CHANNEL);
3580 silc_hash_table_list(channel->user_list, &htl);
3581 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
3582 clidp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
3585 tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_JOIN, 2,
3586 clidp->data, clidp->len,
3587 chidp->data, chidp->len);
3590 silc_buffer_realloc(*channel_users,
3592 (*channel_users)->truelen + len : len));
3593 silc_buffer_pull_tail(*channel_users,
3594 ((*channel_users)->end -
3595 (*channel_users)->data));
3597 silc_buffer_put(*channel_users, tmp->data, tmp->len);
3598 silc_buffer_pull(*channel_users, len);
3599 silc_buffer_free(tmp);
3601 /* CUMODE notify for mode change on the channel */
3602 SILC_PUT32_MSB(chl->mode, mode);
3603 tmp = silc_server_announce_encode_notify(SILC_NOTIFY_TYPE_CUMODE_CHANGE,
3604 3, clidp->data, clidp->len,
3606 clidp->data, clidp->len);
3608 *channel_users_modes =
3609 silc_buffer_realloc(*channel_users_modes,
3610 (*channel_users_modes ?
3611 (*channel_users_modes)->truelen + len : len));
3612 silc_buffer_pull_tail(*channel_users_modes,
3613 ((*channel_users_modes)->end -
3614 (*channel_users_modes)->data));
3616 silc_buffer_put(*channel_users_modes, tmp->data, tmp->len);
3617 silc_buffer_pull(*channel_users_modes, len);
3618 silc_buffer_free(tmp);
3620 silc_buffer_free(clidp);
3622 silc_hash_table_list_reset(&htl);
3623 silc_buffer_free(chidp);
3626 /* Returns assembled packets for all channels and users on those channels
3627 from the given ID List. The packets are in the form dictated by the
3628 New Channel and New Channel User payloads. */
3630 void silc_server_announce_get_channels(SilcServer server,
3632 SilcBuffer *channels,
3633 SilcBuffer *channel_users,
3634 SilcBuffer **channel_users_modes,
3635 SilcUInt32 *channel_users_modes_c,
3636 SilcBuffer **channel_topics,
3637 SilcChannelID ***channel_ids,
3638 unsigned long creation_time)
3640 SilcIDCacheList list;
3641 SilcIDCacheEntry id_cache;
3642 SilcChannelEntry channel;
3645 SilcUInt16 name_len;
3647 int i = *channel_users_modes_c;
3650 SILC_LOG_DEBUG(("Start"));
3652 /* Go through all channels in the list */
3653 if (silc_idcache_get_all(id_list->channels, &list)) {
3654 if (silc_idcache_list_first(list, &id_cache)) {
3656 channel = (SilcChannelEntry)id_cache->context;
3658 if (creation_time && channel->created < creation_time)
3663 cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
3664 id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
3665 name_len = strlen(channel->channel_name);
3668 len = 4 + name_len + id_len + 4;
3670 silc_buffer_realloc(*channels,
3671 (*channels ? (*channels)->truelen +
3673 silc_buffer_pull_tail(*channels,
3674 ((*channels)->end - (*channels)->data));
3675 silc_buffer_format(*channels,
3676 SILC_STR_UI_SHORT(name_len),
3677 SILC_STR_UI_XNSTRING(channel->channel_name,
3679 SILC_STR_UI_SHORT(id_len),
3680 SILC_STR_UI_XNSTRING(cid, id_len),
3681 SILC_STR_UI_INT(channel->mode),
3683 silc_buffer_pull(*channels, len);
3686 /* Channel user modes */
3687 *channel_users_modes = silc_realloc(*channel_users_modes,
3688 sizeof(**channel_users_modes) *
3690 (*channel_users_modes)[i] = NULL;
3691 *channel_ids = silc_realloc(*channel_ids,
3692 sizeof(**channel_ids) * (i + 1));
3693 (*channel_ids)[i] = NULL;
3694 silc_server_announce_get_channel_users(server, channel,
3696 &(*channel_users_modes)[i]);
3697 (*channel_ids)[i] = channel->id;
3699 /* Channel's topic */
3700 *channel_topics = silc_realloc(*channel_topics,
3701 sizeof(**channel_topics) * (i + 1));
3702 (*channel_topics)[i] = NULL;
3703 silc_server_announce_get_channel_topic(server, channel,
3704 &(*channel_topics)[i]);
3707 if (!silc_idcache_list_next(list, &id_cache))
3711 *channel_users_modes_c += i;
3714 silc_idcache_list_free(list);
3718 /* This function is used to announce our existing channels to our router
3719 when we've connected to it. This also announces the users on the
3720 channels to the router. If the `creation_time' is non-zero only the
3721 channels that was created after the `creation_time' are announced.
3722 Note that the channel users are still announced even if the `creation_time'
3725 void silc_server_announce_channels(SilcServer server,
3726 unsigned long creation_time,
3727 SilcSocketConnection remote)
3729 SilcBuffer channels = NULL, channel_users = NULL;
3730 SilcBuffer *channel_users_modes = NULL;
3731 SilcBuffer *channel_topics = NULL;
3732 SilcUInt32 channel_users_modes_c = 0;
3733 SilcChannelID **channel_ids = NULL;
3735 SILC_LOG_DEBUG(("Announcing channels and channel users"));
3737 /* Get channels and channel users in local list */
3738 silc_server_announce_get_channels(server, server->local_list,
3739 &channels, &channel_users,
3740 &channel_users_modes,
3741 &channel_users_modes_c,
3743 &channel_ids, creation_time);
3745 /* Get channels and channel users in global list */
3746 if (server->server_type != SILC_SERVER)
3747 silc_server_announce_get_channels(server, server->global_list,
3748 &channels, &channel_users,
3749 &channel_users_modes,
3750 &channel_users_modes_c,
3752 &channel_ids, creation_time);
3755 silc_buffer_push(channels, channels->data - channels->head);
3756 SILC_LOG_HEXDUMP(("channels"), channels->data, channels->len);
3758 /* Send the packet */
3759 silc_server_packet_send(server, remote,
3760 SILC_PACKET_NEW_CHANNEL, SILC_PACKET_FLAG_LIST,
3761 channels->data, channels->len,
3764 silc_buffer_free(channels);
3767 if (channel_users) {
3768 silc_buffer_push(channel_users, channel_users->data - channel_users->head);
3769 SILC_LOG_HEXDUMP(("channel users"), channel_users->data,
3770 channel_users->len);
3772 /* Send the packet */
3773 silc_server_packet_send(server, remote,
3774 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3775 channel_users->data, channel_users->len,
3778 silc_buffer_free(channel_users);
3781 if (channel_users_modes) {
3784 for (i = 0; i < channel_users_modes_c; i++) {
3785 if (!channel_users_modes[i])
3787 silc_buffer_push(channel_users_modes[i],
3788 channel_users_modes[i]->data -
3789 channel_users_modes[i]->head);
3790 SILC_LOG_HEXDUMP(("channel users modes"), channel_users_modes[i]->data,
3791 channel_users_modes[i]->len);
3792 silc_server_packet_send_dest(server, remote,
3793 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3794 channel_ids[i], SILC_ID_CHANNEL,
3795 channel_users_modes[i]->data,
3796 channel_users_modes[i]->len,
3798 silc_buffer_free(channel_users_modes[i]);
3800 silc_free(channel_users_modes);
3803 if (channel_topics) {
3806 for (i = 0; i < channel_users_modes_c; i++) {
3807 if (!channel_topics[i])
3810 silc_buffer_push(channel_topics[i],
3811 channel_topics[i]->data -
3812 channel_topics[i]->head);
3813 SILC_LOG_HEXDUMP(("channel topic"), channel_topics[i]->data,
3814 channel_topics[i]->len);
3815 silc_server_packet_send_dest(server, remote,
3816 SILC_PACKET_NOTIFY, SILC_PACKET_FLAG_LIST,
3817 channel_ids[i], SILC_ID_CHANNEL,
3818 channel_topics[i]->data,
3819 channel_topics[i]->len,
3821 silc_buffer_free(channel_topics[i]);
3823 silc_free(channel_topics);
3826 silc_free(channel_ids);
3829 /* Failure timeout callback. If this is called then we will immediately
3830 process the received failure. We always process the failure with timeout
3831 since we do not want to blindly trust to received failure packets.
3832 This won't be called (the timeout is cancelled) if the failure was
3833 bogus (it is bogus if remote does not close the connection after sending
3836 SILC_TASK_CALLBACK(silc_server_failure_callback)
3838 SilcServerFailureContext f = (SilcServerFailureContext)context;
3840 if (f->sock->protocol) {
3841 f->sock->protocol->state = SILC_PROTOCOL_STATE_FAILURE;
3842 silc_protocol_execute(f->sock->protocol, f->server->schedule, 0, 0);
3848 /* Assembles user list and users mode list from the `channel'. */
3850 void silc_server_get_users_on_channel(SilcServer server,
3851 SilcChannelEntry channel,
3852 SilcBuffer *user_list,
3853 SilcBuffer *mode_list,
3854 SilcUInt32 *user_count)
3856 SilcChannelClientEntry chl;
3857 SilcHashTableList htl;
3858 SilcBuffer client_id_list;
3859 SilcBuffer client_mode_list;
3861 SilcUInt32 list_count = 0, len = 0;
3863 silc_hash_table_list(channel->user_list, &htl);
3864 while (silc_hash_table_get(&htl, NULL, (void *)&chl))
3865 len += (silc_id_get_len(chl->client->id, SILC_ID_CLIENT) + 4);
3866 silc_hash_table_list_reset(&htl);
3868 client_id_list = silc_buffer_alloc(len);
3870 silc_buffer_alloc(4 * silc_hash_table_count(channel->user_list));
3871 silc_buffer_pull_tail(client_id_list, SILC_BUFFER_END(client_id_list));
3872 silc_buffer_pull_tail(client_mode_list, SILC_BUFFER_END(client_mode_list));
3874 silc_hash_table_list(channel->user_list, &htl);
3875 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
3877 idp = silc_id_payload_encode(chl->client->id, SILC_ID_CLIENT);
3878 silc_buffer_put(client_id_list, idp->data, idp->len);
3879 silc_buffer_pull(client_id_list, idp->len);
3880 silc_buffer_free(idp);
3882 /* Client's mode on channel */
3883 SILC_PUT32_MSB(chl->mode, client_mode_list->data);
3884 silc_buffer_pull(client_mode_list, 4);
3888 silc_hash_table_list_reset(&htl);
3889 silc_buffer_push(client_id_list,
3890 client_id_list->data - client_id_list->head);
3891 silc_buffer_push(client_mode_list,
3892 client_mode_list->data - client_mode_list->head);
3894 *user_list = client_id_list;
3895 *mode_list = client_mode_list;
3896 *user_count = list_count;
3899 /* Saves users and their modes to the `channel'. */
3901 void silc_server_save_users_on_channel(SilcServer server,
3902 SilcSocketConnection sock,
3903 SilcChannelEntry channel,
3904 SilcClientID *noadd,
3905 SilcBuffer user_list,
3906 SilcBuffer mode_list,
3907 SilcUInt32 user_count)
3912 SilcClientID *client_id;
3913 SilcClientEntry client;
3914 SilcIDCacheEntry cache;
3915 SilcChannelClientEntry chl;
3918 SILC_LOG_DEBUG(("Start"));
3920 for (i = 0; i < user_count; i++) {
3922 SILC_GET16_MSB(idp_len, user_list->data + 2);
3924 client_id = silc_id_payload_parse_id(user_list->data, idp_len, NULL);
3925 silc_buffer_pull(user_list, idp_len);
3930 SILC_GET32_MSB(mode, mode_list->data);
3931 silc_buffer_pull(mode_list, 4);
3933 if (noadd && SILC_ID_CLIENT_COMPARE(client_id, noadd)) {
3934 silc_free(client_id);
3940 /* Check if we have this client cached already. */
3941 client = silc_idlist_find_client_by_id(server->local_list, client_id,
3942 server->server_type, &cache);
3944 client = silc_idlist_find_client_by_id(server->global_list,
3945 client_id, server->server_type,
3950 /* If router did not find such Client ID in its lists then this must
3951 be bogus client or some router in the net is buggy. */
3952 if (server->server_type == SILC_ROUTER) {
3953 silc_free(client_id);
3957 /* We don't have that client anywhere, add it. The client is added
3958 to global list since server didn't have it in the lists so it must be
3960 client = silc_idlist_add_client(server->global_list, NULL, NULL, NULL,
3961 silc_id_dup(client_id, SILC_ID_CLIENT),
3962 sock->user_data, NULL, 0);
3964 SILC_LOG_ERROR(("Could not add new client to the ID Cache"));
3965 silc_free(client_id);
3969 client->data.status |= SILC_IDLIST_STATUS_REGISTERED;
3971 /* Found, if it is from global list we'll assure that we won't
3972 expire it now that the entry is on channel. */
3977 silc_free(client_id);
3979 if (!silc_server_client_on_channel(client, channel, &chl)) {
3980 /* Client was not on the channel, add it. */
3981 chl = silc_calloc(1, sizeof(*chl));
3982 chl->client = client;
3984 chl->channel = channel;
3985 silc_hash_table_add(channel->user_list, chl->client, chl);
3986 silc_hash_table_add(client->channels, chl->channel, chl);
3987 channel->user_count++;
3995 /* Saves channels and channels user modes to the `client'. Removes
3996 the client from those channels that are not sent in the list but
3999 void silc_server_save_user_channels(SilcServer server,
4000 SilcSocketConnection sock,
4001 SilcClientEntry client,
4002 SilcBuffer channels,
4003 SilcBuffer channels_user_modes)
4006 SilcUInt32 *chumodes;
4007 SilcChannelPayload entry;
4008 SilcChannelEntry channel;
4009 SilcChannelID *channel_id;
4010 SilcChannelClientEntry chl;
4011 SilcHashTable ht = NULL;
4012 SilcHashTableList htl;
4016 if (!channels ||!channels_user_modes)
4019 ch = silc_channel_payload_parse_list(channels->data, channels->len);
4020 if (ch && silc_get_mode_list(channels_user_modes, silc_dlist_count(ch),
4022 ht = silc_hash_table_alloc(0, silc_hash_ptr, NULL, NULL,
4023 NULL, NULL, NULL, TRUE);
4024 silc_dlist_start(ch);
4025 while ((entry = silc_dlist_get(ch)) != SILC_LIST_END) {
4026 /* Check if we have this channel, and add it if we don't have it.
4027 Also add the client on the channel unless it is there already. */
4028 channel_id = silc_channel_get_id_parse(entry);
4029 channel = silc_idlist_find_channel_by_id(server->local_list,
4032 channel = silc_idlist_find_channel_by_id(server->global_list,
4035 if (server->server_type != SILC_SERVER) {
4036 silc_free(channel_id);
4041 /* We don't have that channel anywhere, add it. */
4042 name = silc_channel_get_name(entry, NULL);
4043 channel = silc_idlist_add_channel(server->global_list, strdup(name), 0,
4044 channel_id, server->router,
4047 silc_free(channel_id);
4054 channel->mode = silc_channel_get_mode(entry);
4056 /* Add the client on the channel */
4057 if (!silc_server_client_on_channel(client, channel, &chl)) {
4058 chl = silc_calloc(1, sizeof(*chl));
4059 chl->client = client;
4060 chl->mode = chumodes[i++];
4061 chl->channel = channel;
4062 silc_hash_table_add(channel->user_list, chl->client, chl);
4063 silc_hash_table_add(client->channels, chl->channel, chl);
4064 channel->user_count++;
4067 chl->mode = chumodes[i++];
4070 silc_hash_table_add(ht, channel, channel);
4071 silc_free(channel_id);
4073 silc_channel_payload_list_free(ch);
4074 silc_free(chumodes);
4078 /* Go through the list again and remove client from channels that
4079 are no part of the list. */
4081 silc_hash_table_list(client->channels, &htl);
4082 while (silc_hash_table_get(&htl, NULL, (void **)&chl)) {
4083 if (!silc_hash_table_find(ht, chl->channel, NULL, NULL)) {
4084 silc_hash_table_del(chl->channel->user_list, chl->client);
4085 silc_hash_table_del(chl->client->channels, chl->channel);
4089 silc_hash_table_list_reset(&htl);
4090 silc_hash_table_free(ht);
4092 silc_hash_table_list(client->channels, &htl);
4093 while (silc_hash_table_get(&htl, NULL, (void **)&chl)) {
4094 silc_hash_table_del(chl->channel->user_list, chl->client);
4095 silc_hash_table_del(chl->client->channels, chl->channel);
4098 silc_hash_table_list_reset(&htl);
4102 /* Lookups route to the client indicated by the `id_data'. The connection
4103 object and internal data object is returned. Returns NULL if route
4104 could not be found to the client. If the `client_id' is specified then
4105 it is used and the `id_data' is ignored. */
4107 SilcSocketConnection
4108 silc_server_get_client_route(SilcServer server,
4109 unsigned char *id_data,
4111 SilcClientID *client_id,
4112 SilcIDListData *idata,
4113 SilcClientEntry *client_entry)
4116 SilcClientEntry client;
4118 SILC_LOG_DEBUG(("Start"));
4121 *client_entry = NULL;
4123 /* Decode destination Client ID */
4125 id = silc_id_str2id(id_data, id_len, SILC_ID_CLIENT);
4127 SILC_LOG_ERROR(("Could not decode destination Client ID, dropped"));
4131 id = silc_id_dup(client_id, SILC_ID_CLIENT);
4134 /* If the destination belongs to our server we don't have to route
4135 the packet anywhere but to send it to the local destination. */
4136 client = silc_idlist_find_client_by_id(server->local_list, id, TRUE, NULL);
4140 /* If we are router and the client has router then the client is in
4141 our cell but not directly connected to us. */
4142 if (server->server_type == SILC_ROUTER && client->router) {
4143 /* We are of course in this case the client's router thus the route
4144 to the client is the server who owns the client. So, we will send
4145 the packet to that server. */
4147 *idata = (SilcIDListData)client->router;
4148 return client->router->connection;
4151 /* Seems that client really is directly connected to us */
4153 *idata = (SilcIDListData)client;
4155 *client_entry = client;
4156 return client->connection;
4159 /* Destination belongs to someone not in this server. If we are normal
4160 server our action is to send the packet to our router. */
4161 if (server->server_type != SILC_ROUTER && !server->standalone) {
4164 *idata = (SilcIDListData)server->router;
4165 return server->router->connection;
4168 /* We are router and we will perform route lookup for the destination
4169 and send the packet to fastest route. */
4170 if (server->server_type == SILC_ROUTER && !server->standalone) {
4171 /* Check first that the ID is valid */
4172 client = silc_idlist_find_client_by_id(server->global_list, id,
4175 SilcSocketConnection dst_sock;
4177 dst_sock = silc_server_route_get(server, id, SILC_ID_CLIENT);
4181 *idata = (SilcIDListData)dst_sock->user_data;
4190 /* Encodes and returns channel list of channels the `client' has joined.
4191 Secret channels are not put to the list. */
4193 SilcBuffer silc_server_get_client_channel_list(SilcServer server,
4194 SilcClientEntry client,
4197 SilcBuffer *user_mode_list)
4199 SilcBuffer buffer = NULL;
4200 SilcChannelEntry channel;
4201 SilcChannelClientEntry chl;
4202 SilcHashTableList htl;
4205 SilcUInt16 name_len;
4209 *user_mode_list = NULL;
4211 silc_hash_table_list(client->channels, &htl);
4212 while (silc_hash_table_get(&htl, NULL, (void *)&chl)) {
4213 channel = chl->channel;
4215 if (channel->mode & SILC_CHANNEL_MODE_SECRET && !get_secret)
4217 if (channel->mode & SILC_CHANNEL_MODE_PRIVATE && !get_private)
4220 cid = silc_id_id2str(channel->id, SILC_ID_CHANNEL);
4221 id_len = silc_id_get_len(channel->id, SILC_ID_CHANNEL);
4222 name_len = strlen(channel->channel_name);
4224 len = 4 + name_len + id_len + 4;
4225 buffer = silc_buffer_realloc(buffer,
4226 (buffer ? buffer->truelen + len : len));
4227 silc_buffer_pull_tail(buffer, (buffer->end - buffer->data));
4228 silc_buffer_format(buffer,
4229 SILC_STR_UI_SHORT(name_len),
4230 SILC_STR_UI_XNSTRING(channel->channel_name,
4232 SILC_STR_UI_SHORT(id_len),
4233 SILC_STR_UI_XNSTRING(cid, id_len),
4234 SILC_STR_UI_INT(chl->channel->mode),
4236 silc_buffer_pull(buffer, len);
4239 if (user_mode_list) {
4240 *user_mode_list = silc_buffer_realloc(*user_mode_list,
4242 (*user_mode_list)->truelen + 4 :
4244 silc_buffer_pull_tail(*user_mode_list, ((*user_mode_list)->end -
4245 (*user_mode_list)->data));
4246 SILC_PUT32_MSB(chl->mode, (*user_mode_list)->data);
4247 silc_buffer_pull(*user_mode_list, 4);
4250 silc_hash_table_list_reset(&htl);
4253 silc_buffer_push(buffer, buffer->data - buffer->head);
4254 if (user_mode_list && *user_mode_list)
4255 silc_buffer_push(*user_mode_list, ((*user_mode_list)->data -
4256 (*user_mode_list)->head));
4261 /* Finds client entry by Client ID and if it is not found then resolves
4262 it using WHOIS command. */
4264 SilcClientEntry silc_server_get_client_resolve(SilcServer server,
4265 SilcClientID *client_id,
4266 bool always_resolve,
4269 SilcClientEntry client;
4274 client = silc_idlist_find_client_by_id(server->local_list, client_id,
4277 client = silc_idlist_find_client_by_id(server->global_list,
4278 client_id, TRUE, NULL);
4279 if (!client && server->server_type == SILC_ROUTER)
4283 if (!client && server->standalone)
4286 if (!client || !client->nickname || !client->username ||
4288 SilcBuffer buffer, idp;
4291 client->data.status |= SILC_IDLIST_STATUS_RESOLVING;
4292 client->data.status &= ~SILC_IDLIST_STATUS_RESOLVED;
4293 client->resolve_cmd_ident = ++server->cmd_ident;
4296 idp = silc_id_payload_encode(client_id, SILC_ID_CLIENT);
4297 buffer = silc_command_payload_encode_va(SILC_COMMAND_WHOIS,
4298 server->cmd_ident, 1,
4299 3, idp->data, idp->len);
4300 silc_server_packet_send(server, client ? client->router->connection :
4301 server->router->connection,
4302 SILC_PACKET_COMMAND, 0,
4303 buffer->data, buffer->len, FALSE);
4304 silc_buffer_free(idp);
4305 silc_buffer_free(buffer);
4316 /* A timeout callback for the re-key. We will be the initiator of the
4319 SILC_TASK_CALLBACK(silc_server_rekey_callback)
4321 SilcSocketConnection sock = (SilcSocketConnection)context;
4322 SilcIDListData idata = (SilcIDListData)sock->user_data;
4323 SilcServer server = (SilcServer)idata->rekey->context;
4324 SilcProtocol protocol;
4325 SilcServerRekeyInternalContext *proto_ctx;
4327 SILC_LOG_DEBUG(("Start"));
4329 /* Allocate internal protocol context. This is sent as context
4331 proto_ctx = silc_calloc(1, sizeof(*proto_ctx));
4332 proto_ctx->server = (void *)server;
4333 proto_ctx->sock = sock;
4334 proto_ctx->responder = FALSE;
4335 proto_ctx->pfs = idata->rekey->pfs;
4337 /* Perform rekey protocol. Will call the final callback after the
4338 protocol is over. */
4339 silc_protocol_alloc(SILC_PROTOCOL_SERVER_REKEY,
4340 &protocol, proto_ctx, silc_server_rekey_final);
4341 sock->protocol = protocol;
4343 /* Run the protocol */
4344 silc_protocol_execute(protocol, server->schedule, 0, 0);
4346 /* Re-register re-key timeout */
4347 silc_schedule_task_add(server->schedule, sock->sock,
4348 silc_server_rekey_callback,
4349 context, idata->rekey->timeout, 0,
4350 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
4353 /* The final callback for the REKEY protocol. This will actually take the
4354 new key material into use. */
4356 SILC_TASK_CALLBACK_GLOBAL(silc_server_rekey_final)
4358 SilcProtocol protocol = (SilcProtocol)context;
4359 SilcServerRekeyInternalContext *ctx =
4360 (SilcServerRekeyInternalContext *)protocol->context;
4361 SilcServer server = (SilcServer)ctx->server;
4362 SilcSocketConnection sock = ctx->sock;
4364 SILC_LOG_DEBUG(("Start"));
4366 if (protocol->state == SILC_PROTOCOL_STATE_ERROR ||
4367 protocol->state == SILC_PROTOCOL_STATE_FAILURE) {
4368 /* Error occured during protocol */
4369 SILC_LOG_ERROR(("Error occurred during rekey protocol"));
4370 silc_protocol_cancel(protocol, server->schedule);
4371 silc_protocol_free(protocol);
4372 sock->protocol = NULL;
4374 silc_packet_context_free(ctx->packet);
4376 silc_ske_free(ctx->ske);
4381 /* Purge the outgoing data queue to assure that all rekey packets really
4382 go to the network before we quit the protocol. */
4383 silc_server_packet_queue_purge(server, sock);
4386 silc_protocol_free(protocol);
4387 sock->protocol = NULL;
4389 silc_packet_context_free(ctx->packet);
4391 silc_ske_free(ctx->ske);
4395 /* Task callback used to retrieve network statistical information from
4396 router server once in a while. */
4398 SILC_TASK_CALLBACK(silc_server_get_stats)
4400 SilcServer server = (SilcServer)context;
4401 SilcBuffer idp, packet;
4403 SILC_LOG_DEBUG(("Retrieving stats from router"));
4405 if (!server->standalone) {
4406 idp = silc_id_payload_encode(server->router->id, SILC_ID_SERVER);
4407 packet = silc_command_payload_encode_va(SILC_COMMAND_STATS,
4408 ++server->cmd_ident, 1,
4409 1, idp->data, idp->len);
4410 silc_server_packet_send(server, server->router->connection,
4411 SILC_PACKET_COMMAND, 0, packet->data,
4412 packet->len, FALSE);
4413 silc_buffer_free(packet);
4414 silc_buffer_free(idp);
4417 silc_schedule_task_add(server->schedule, 0, silc_server_get_stats,
4418 server, 120, 0, SILC_TASK_TIMEOUT,